Port to LWJGL version 3 else the game won't start with Java 11

LWJGL 2.9 doesn't work with Java 11. 

The game has to be ported to LWJGL 3.0, else the game won't start and displays the following error message: 
```
Inconsistency detected by ld.so: dl-lookup.c: 111: check_match: Assertion `version->filename == NULL || ! _dl_name_match_p (version->filename, map)' failed!
```