Changed code from Python 2 to Python 3. Fixed few issues.
Added partial test for cache_handler. cache_handler doesn't work. Or eveapi doens't work.
Fixed cache_handler hash function that's used to store cache. Added cache_handler tests.
Added simple gui window that displays skill queue data. There is a bug - EveWrapper caches the data forever.
Added update_cache method to wrappers to override the wrapper cache.
Added adequate displaying of skill queue. Added separated class for skill queue frame.
Methods that start with '__' changed to start only with '_'. Added ReadOnlyText class. Cache handler tests fail.

Test fail cause of non-implemented purge_all_cache method that should clear all caches.
Fixed CacheHandler tests. Added automatical data loading on the applciation start-up.