Update to version 21.04 — XLarn Steam update #1346009

This update mainly adresses game functionality on linux. - added fullscreen option on linux - fixed an issue with dual screen setups on linux - fixed numpad enter key not working on linux - added a score multiplier because the game got a lot harder after the last patch - added coloring in the character sheet when stats are changing (stat turns red for a negative change and green for a positive one) - added a few missing german translations - fixed a bug where your strength won't be updated after a giant ant or centipede stung you - fixed a bug where a broken ladder on a hole in the ceiling would cause the player to fall into a pit - fixed a few issues with altars in the temple Also we made a twitter account to do stuff like community actions, giveaways and showing new features in development.