v0.6.8

boring maintenance release!

Notes:

• the play store made us do a release to bump the targetsdk version!
  • thanks google!
  • anyway, the apk is now 500kb smaller. So that's nice
• misc small bugfixes, including security/hardening upgrades for decoder
• the shader used for the encoder view now targets an older GLSL standard, which might allow it to work on (certain) older devices
• the encoder view now uses reproducible build bits. If you don't know what this is, don't worry about it. :)
  • fdroid build still broken, hoping this helps a bit... may have to fix it myself...

See also:
https://github.com/sz3/libcimbar/releases/tag/v0.6.8
#72