Changes

See desc

* use cglm as matrix library
* link with LTO
* improve hit detection: now OBB-Ray instead of AABB-Ray
* hitbox more tight (e.g. player arms)
* cache fonts in a hash table (instead of list)
* remove dead code in some places
* disable world update ticks e.g. on server-list
* player part that was hit now based on actual distance (when multiple 
parts of a player have been hit)
* hitbox now hard-coded
* AABB intersection test reverted back to original code
 (commit: 2e1b032)