add keepass csv export; improve hotp

- export to dedicated totp and hotp csv files for KeePass
- show Typ as totp/hotp instead of OTP_TOTP/OTP_HOTP
  (BREAKING CHANGE in csv, json and stdout, qr codes or urls are not affected)
- add hotp example
- add hotp tests
- export counter for hotp to csv and json files
- add section on KeePass to README
- increase protobuf to 4.21.10
- show file names of exported csv or json files

test/example_export_only_totp.txt

@@ -0,0 +1,11 @@
+# 2FA example from https://www.raspberrypi.org/blog/setting-up-two-factor-authentication-on-your-raspberry-pi/
+# Secret key: 7KSQL2JTUDIS5EF65KLMRQIIGY
+# otpauth://totp/pi@raspberrypi?secret=7KSQL2JTUDIS5EF65KLMRQIIGY&issuer=raspberrypi
+otpauth-migration://offline?data=CjUKEPqlBekzoNEukL7qlsjBCDYSDnBpQHJhc3BiZXJyeXBpGgtyYXNwYmVycnlwaSABKAEwAhABGAEgACjr4JKK%2B%2F%2F%2F%2F%2F8B
+
+# otpauth://totp/pi@raspberrypi?secret=7KSQL2JTUDIS5EF65KLMRQIIGY
+otpauth-migration://offline?data=CigKEPqlBekzoNEukL7qlsjBCDYSDnBpQHJhc3BiZXJyeXBpIAEoATACEAEYASAAKLzjp5n4%2F%2F%2F%2F%2FwE%3D
+
+# otpauth://totp/pi@raspberrypi?secret=7KSQL2JTUDIS5EF65KLMRQIIGY&issuer=raspberrypi
+# otpauth://totp/pi@raspberrypi?secret=7KSQL2JTUDIS5EF65KLMRQIIGY
+otpauth-migration://offline?data=CigKEPqlBekzoNEukL7qlsjBCDYSDnBpQHJhc3BiZXJyeXBpIAEoATACCjUKEPqlBekzoNEukL7qlsjBCDYSDnBpQHJhc3BiZXJyeXBpGgtyYXNwYmVycnlwaSABKAEwAhABGAEgACiQ7OOa%2Bf%2F%2F%2F%2F8B

test/print_verbose_output.txt

@@ -18,10 +18,10 @@ batch_id: -1320898453
 
 
 1. Secret Key
-Name:   pi@raspberrypi
-Secret: 7KSQL2JTUDIS5EF65KLMRQIIGY
-Issuer: raspberrypi
-Type:   OTP_TOTP
+Name:    pi@raspberrypi
+Secret:  7KSQL2JTUDIS5EF65KLMRQIIGY
+Issuer:  raspberrypi
+Type:    totp
 otpauth://totp/pi%40raspberrypi?secret=7KSQL2JTUDIS5EF65KLMRQIIGY&issuer=raspberrypi
 
 
@@ -42,9 +42,9 @@ batch_id: -2094403140
 
 
 2. Secret Key
-Name:   pi@raspberrypi
-Secret: 7KSQL2JTUDIS5EF65KLMRQIIGY
-Type:   OTP_TOTP
+Name:    pi@raspberrypi
+Secret:  7KSQL2JTUDIS5EF65KLMRQIIGY
+Type:    totp
 otpauth://totp/pi%40raspberrypi?secret=7KSQL2JTUDIS5EF65KLMRQIIGY
 
 
@@ -74,16 +74,41 @@ batch_id: -1822886384
 
 
 3. Secret Key
-Name:   pi@raspberrypi
-Secret: 7KSQL2JTUDIS5EF65KLMRQIIGY
-Type:   OTP_TOTP
+Name:    pi@raspberrypi
+Secret:  7KSQL2JTUDIS5EF65KLMRQIIGY
+Type:    totp
 otpauth://totp/pi%40raspberrypi?secret=7KSQL2JTUDIS5EF65KLMRQIIGY
 
 
 4. Secret Key
-Name:   pi@raspberrypi
-Secret: 7KSQL2JTUDIS5EF65KLMRQIIGY
-Issuer: raspberrypi
-Type:   OTP_TOTP
+Name:    pi@raspberrypi
+Secret:  7KSQL2JTUDIS5EF65KLMRQIIGY
+Issuer:  raspberrypi
+Type:    totp
 otpauth://totp/pi%40raspberrypi?secret=7KSQL2JTUDIS5EF65KLMRQIIGY&issuer=raspberrypi
 
+
+# otpauth://hotp/hotp%20demo?secret=7KSQL2JTUDIS5EF65KLMRQIIGY&counter=4
+otpauth-migration://offline?data=CiUKEPqlBekzoNEukL7qlsjBCDYSCWhvdHAgZGVtbyABKAEwATgEEAEYASAAKNuv15j6%2F%2F%2F%2F%2FwE%3D
+
+4. Payload Line
+otp_parameters {
+  secret: "\372\245\005\3513\240\321.\220\276\352\226\310\301\0106"
+  name: "hotp demo"
+  algorithm: ALGO_SHA1
+  digits: 1
+  type: OTP_HOTP
+  counter: 4
+}
+version: 1
+batch_size: 1
+batch_id: -1558849573
+
+
+5. Secret Key
+Name:    hotp demo
+Secret:  7KSQL2JTUDIS5EF65KLMRQIIGY
+Type:    hotp
+Counter: 4
+otpauth://hotp/hotp%20demo?secret=7KSQL2JTUDIS5EF65KLMRQIIGY&counter=4
+

test/printqr_output.txt

@@ -1,7 +1,7 @@
-Name:   pi@raspberrypi
-Secret: 7KSQL2JTUDIS5EF65KLMRQIIGY
-Issuer: raspberrypi
-Type:   OTP_TOTP
+Name:    pi@raspberrypi
+Secret:  7KSQL2JTUDIS5EF65KLMRQIIGY
+Issuer:  raspberrypi
+Type:    totp
                                              
                                              
     █▀▀▀▀▀█  ▄▀▄▄█ █▀  ▀▀▀▀▀█  ▄▄ █▀▀▀▀▀█    
@@ -26,9 +26,9 @@ Type:   OTP_TOTP
                                              
                                              
 
-Name:   pi@raspberrypi
-Secret: 7KSQL2JTUDIS5EF65KLMRQIIGY
-Type:   OTP_TOTP
+Name:    pi@raspberrypi
+Secret:  7KSQL2JTUDIS5EF65KLMRQIIGY
+Type:    totp
                                          
                                          
     █▀▀▀▀▀█ ▀▀██ █▄▀█ ▀▄▄▀█▀▄ █▀▀▀▀▀█    
@@ -51,9 +51,9 @@ Type:   OTP_TOTP
                                          
                                          
 
-Name:   pi@raspberrypi
-Secret: 7KSQL2JTUDIS5EF65KLMRQIIGY
-Type:   OTP_TOTP
+Name:    pi@raspberrypi
+Secret:  7KSQL2JTUDIS5EF65KLMRQIIGY
+Type:    totp
                                          
                                          
     █▀▀▀▀▀█ ▀▀██ █▄▀█ ▀▄▄▀█▀▄ █▀▀▀▀▀█    
@@ -76,10 +76,10 @@ Type:   OTP_TOTP
                                          
                                          
 
-Name:   pi@raspberrypi
-Secret: 7KSQL2JTUDIS5EF65KLMRQIIGY
-Issuer: raspberrypi
-Type:   OTP_TOTP
+Name:    pi@raspberrypi
+Secret:  7KSQL2JTUDIS5EF65KLMRQIIGY
+Issuer:  raspberrypi
+Type:    totp
                                              
                                              
     █▀▀▀▀▀█  ▄▀▄▄█ █▀  ▀▀▀▀▀█  ▄▄ █▀▀▀▀▀█    
@@ -104,3 +104,31 @@ Type:   OTP_TOTP
                                              
                                              
 
+Name:    hotp demo
+Secret:  7KSQL2JTUDIS5EF65KLMRQIIGY
+Type:    hotp
+Counter: 4
+                                             
+                                             
+    █▀▀▀▀▀█ ▄█▀▄▄ ▄▄▄██  █▄▄██ █▄ █▀▀▀▀▀█    
+    █ ███ █  ▀▄   ▄▄▄  ▀▄ ▄▄▀ █▀  █ ███ █    
+    █ ▀▀▀ █ ▀█ ▄▄█▄  ▄▀█▀▀██▄▄██▄ █ ▀▀▀ █    
+    ▀▀▀▀▀▀▀ ▀▄▀ █▄▀▄█▄█▄█ ▀▄█▄█ █ ▀▀▀▀▀▀▀    
+    █▄█ █ ▀▄▄ ▀ ▄▄███▄█▄   ▄█▀ ▀█  ▄█▄▄▀▄    
+    ▄██▄▀▄▀██▄▀▄▀ ▀▀█ ▀▄ █▄▀██▄  ▀▄▀▀▀▄█▀    
+    ▄ ▄█▄▀▀▀▀█▄▄▄▀▄█▄ ▄ ▄██▀█▀▄ ▀▄█▄ █▀▀█    
+    ▄▀▄▀██▀█▀  ██▀▄ ▀▀ ▄▄▄█▄██ ▄▀█▄▄▄ ▀▄▀    
+    █▄▀▀▀█▀█▄ ▄ ▀ ▀█ ▄ ▄█ █▄▀█▄ █▄█    ▀▄    
+    ▀▀██▄█▀  ▄█▄▀▀█▄ ▄█▀██▄▄█▄  █▀▄█ ▀▀▀█    
+    █████▄▀▀█▀▀█▀▀▄  ▄ ▀█▀▄ ██▄ ▄███ ▄▀█     
+     ▄▄█▀▀▀█▀█▄█  ▄█▄▄█ ▀▀ ▄▀▄ ▄█▀▄▄█▀▀▄▄    
+     ██▄ █▀▄▀▀ █  ▀██ █▄ ▄   █  ▀▄█▀▄█▄██    
+    ▀▄▀ █ ▀▄▀▄██▄█ ▀█▀▄▄ ██▄▄▄▀ ▀▄ ▄█ ███    
+    ▀  ▀▀ ▀▀▄ ▄▄▄█▄██▀▀ ▄█ ▀ █▀▀█▀▀▀█▀  █    
+    █▀▀▀▀▀█  █▄█▀█▀▀█▀   ▄█ ▀▄▄▀█ ▀ █▀▀ ▀    
+    █ ███ █ ▀█▀▀ ▀ █ ▄ ▄█▄█  █▄ █▀▀██▀ ██    
+    █ ▀▀▀ █ ▀▄▀▄█▀▀▄  ▀▀█▄▄ ▀▄▄█   █▀▀▀▄▀    
+    ▀▀▀▀▀▀▀ ▀▀▀▀  ▀ ▀  ▀▀▀   ▀▀ ▀ ▀▀▀▀ ▀▀    
+                                             
+                                             
+