* disable the screen saver while the game is running
* select the last played map in the map selector
* yet another icon size
* updated changelog
* don't include the CommandSystem header in IConsole.h
* better way to extract the theme from the name
* fixed potential invalid iterator usage
* Rather huge commit - too lazy to split it up

* updated emscripten setup and fixed some compile issues
* we don't need the GLContext if shaders are disabled
* include glext headers for GLchar and GLenum
* fixed typo in filelist creation
* only use rwops in the filesystem
* removed pre sdl2 support
* fixed typo in class name
* removed unused emscripten code
* removed BASEDIR variable
* include the assets
* moved impressum into main page
* fixed rerunning of emscripten-setup
* another attempt to import the env vars
* this header does not exist (fixed android build)
* store your own solution for later replays
* updated TODO
* fixed typo in file name
* split tutorial and xsokoban campaign