UI Revamp: tweaks & move mouse-delta stuff to stdlib.cfg.
fix waterenv reflect vector
UI Revamp: rename blendmap & heightmap cfgs
lightthreads simplification
Allow "lightthreads -1" to use one less than available CPUs.
Increase "numcpus" max to 256. To match 'lightthreads' increase.
UI Revamp: tweaks & move menu_.cfgs to subdirectory.
suite texture tweaks and variation.
Increase "lightthreads" max to 256.
dg texture variation.
