--------------------
 TODO (Things hat can pop in new version, or be forgotten)
----------

 -customgame key to load customgame.txt (custom game properties)

 -customentities key to load customentities.txt which defines default fields for entities (and also can redefine classname):

 Example:
 
 func_door	
 {
	_rs	"1"
 }
 monster_ogre_merchant
 {
	classname "monster_ogre"
	health "100000000"
	spawnflags "256"
 }
 lamp_ceiling_vertical
 {
	classname "light_lamp"
	angle "-1"
 }

 (feature) -nofloodlight to disable any floodlight

 (feature) _skylight <scale> worldspawn key to scale up sky light intensity

 (idea) add -sun <filename> light switch to light phase to compile external lightmap/lightgrid only for sun. Lightmaps are low-quality and grayscale (they are colored by the engine). Keep support for different deviations (engine will interpolate between them).

 (idea) _subModel key to merge up entity model into bsp (as sub-model) when compiling

 (idea) _copyEntity <entity_targetname> - remove self brushes/properties and copy them from matching _targetname entity. This would be useful for cloning of high-poly stuff like custom crates.
