Add option to encrypt log files

[0xRustlang]

Hello Thank you for your great app. It is always on in my phone and is really great.

The only thing i would like to request, please if may add an option to the app so we can set an password in gpslogger settings and it automatically encrypt log files.

This is specially useful when we set the app to automatically upload log files to cloud.

Because of nature of location log files, i think they are really sensitive. (from both security and/or privacy perspective)

If may please add this option. That will be really great.

If you like you can see the source code of "AndOTP" for seeing how it implemented such option.

Thank you very much

[0xRustlang]

Thank you for starting to update this great app again.

If may please consider this also.

Thanks.