minor aesthetic string-output fixes in /entityShow
sort variables of gentity_t by similarity, so that we easier spot duplicates
rename MAX_ALIASES and MAX_TARGETS to MAX_ENTITY_ALIASES and MAX_ENTITY_TARGETS to avoid nameclashes
rename some variables for clarity
merge buildTime and startTime (when a missile was fired) into creationTime
simplify how trigger_multiple is handling spawnflags and abstract it as compat-function towards the sensors