Database added

Implemented basic database interface
Changed the views of players and opponents
Abandoned including photos of players
Integration with EGD

Downloading and parsing - at the momemnt inefficient
Implemented some concepts on sharing data between activities and
displaying players on the list
Integration with EGD

Done: downloading zip and storing players in DB
Done: selecting players from DB
EGD Integration

Added option to manually update data
Fixes
Fix to previous commit

weird error in calculator.xml
Usability improvement

Current player is automatically memorized
Added possibility to save filter configuration as default
Cleanup

Updated readme
Cleaned up some code