add temporary Ouroboros logo, thanks Lenny for vectorizing
change logo file names
Desktop file now includes proper exec using the app binary name
fix genicons for use with libicns
MSA Client ID has been moved to CMakeLists.txt, and defaults to the
Client ID for the PolyMC application.
Removed secrets/notsecrets library, replace with (temporary?)
program_info subdirectory.
This makes the account system much more modular
and makes it treat errors as something recoverable,
unless they come directly from the MSA refresh token
becoming invalid.
