Changes

See desc
* mention GLEW in readme
* show connection alert when no internet is available
* zoom camera closer in join dialog
* fix up greedy meshing
* remove opengl es build syntax errors
* allow voxlap style model rendering
* auto create missing directories
* press F12 to show network stats like on voxlap aos
* highlight local player on scoreboard
* allow dragging of the server list
* dont render player when not necessary
* scale player head according to orientation vector length (used in 
zombie mode)
* give dead player body a bounding box
* compute 2D bounding box of every player
 (commit: fcb2841)