fix demotool compile
update pr-downloader
fix #4424
fix #4437: /set GrassDetail X
grassdrawer render fartextures 100% on the gpu w/o a cpu readback
fix compile with old GLEWs
grassdrawer: a modern cpu is able to iterate 32x32 structs w/o any performance cost
fix compile
fix typo
GetPhysicalCpuCores: remove vendor specific detection and trust fully x86 specs
try to fix validation-test
again try reduce travis-ci time:

build failure because time used > 50 minutes
fix #4440
be more explicit
fix #4444: sdd's weren't found under windows
fix stuck shift state in camera movements
don't catch `edit_*` actions when there is no chatting atm
GetPhysicalCpuCores: disable till fixed
TempHoldFire on start build (fix #2420)
apply 'Un-hardcode wobble reduction' PR by sprung (with some refactoring)