Changes

See desc
* introduce opengl es 1.1 compatibility (close #55)
* changed font code to only use triangles
* reallow changing team/gun when dead/spectating (bug)
* added localhost entry to serverlist for quick connection
* reuse memory allocation between update_physics() calls
* spawn particles on spade right click like on voxlap
* moved reason_disconnect() to network.c
* correctly position player arm's pivot
* shotgun block damage lowered to prevent kick
 (commit: bf1f3db)