Spells now show their effect text. Currently this causes alignment issues because it is a long string of text
truncating the effect string to fix bad alignments
corrected `CannotUseUnknownCards` system
Renamed `CannotUseUnknownCards` to end with `System`
Merge branch 'develop' of github.com:Cardshifter/Cardshifter into client-server
Merge branch 'javafx' of github.com:Cardshifter/Cardshifter into client-server
fixed sporadious bug in game test. Fixes #134