Fixed Bugs from last version.
Added more information in the Device Discovery screen.
Added refresh icon.
Added refresh possibility for the Leaderboard.
Added new bonus exp feature.
Added new possibility to enable background.
Introduced the Achievement system.
For now 4 first achievements for test purposes.
Added decimal points to numbers.
Achievements give bonus percent exp.
Expierence is multiplicated with 2 to get a feelable bonus of the
achievements.
Added Exception handling.