Update src/game/server/gamecontext.cpp
Added beast.png and veteran.png skins by whis
Bug: Losing render-commands if commandbuffer is full(gfx)

Problem:
If there is a new draw call, it is checked if there is enough free memory for the vertices in the databuffer but not if we have enough free space in the commandbuffer to add the command
So we lose some commands during a frame cuz the commandbuffer is full

This fixes the 2nd part of issue 1004
fixed last commit
set default value for asynchronous rendering to disabled for now. #1001
Fixed team blocking by disconnect (Closes #206)
prevent bullets from drifting
Fixes not displaying the nick when /rank {nick} is used. (Closes #197)
Version Bump to 1.15a. (Closes #198)
Added try catch block to deal with languages dir not found
missing tele tile
obst skins (Closes #211)
Forward CFLAGS and LDFLAGS to the compiler (Closes DDRace/teeworlds#212)
Fix problem with show other players: (Closes DDRace/teeworlds#210)

sending packet on setting change
Defaults to gfx_threaded 0. Partially fixes #213
Fixing network compatibility issue for older ddrace clients..
Merge pull request #216 from cinaera/ddrace_compatibility

Fixing network compatibility issue for older ddrace clients.
fixed map downloading auth check
Merge remote-tracking branch 'upstream/DDRace' into DDRace