move KillBrushModel next to KillBox
don't call touch function on disabled entities for buildings
add onSpawn event to tables
fire ON_SPAWN event for fixed spawnpoints and intermission cams
add G_EventFireEntity to header
add include guard to g_spawn.h
move entity related constants and enums into own headerfile g_entities.h
replace multi-referenced entityclassnames with #define's
rename plat and door "triggers" into "sensors"
use more etos() in spawn and validation warnings
replace entity related warning, error and debug prefixes on printfs with a #define version in q_shared
put the the worldspawn class into a define and adapt error messages around that
rename CONTENTS_TRIGGER to CONTENTS_SENSOR
refactor teleporting and pushing entitytypes to shorter names without the "trigger" terminology
separate concepts of "delay", "period" and "wait" in type and fieldtable, while keeping entities yet bound to wait only for backward compatibility