Editing ACS spawn ID

ACS spawn IDs are numbers used in ACS functions to represent thing types. They are separate from Doom editor numbers, and were initially designed to fit in a 0-255 interval, as required by the Hexen format where the ACS language started.

Spawn IDs can be identified by constants, as defined in [https://github.com/UZDoom/acc/blob/55dbbb6dcab563f40d6c8c8655a2fac3d12616f7/zdefs.acs#L426-L611 zdefs.acs]. A notable value is '''T_NONE''' (0), which can mean "anything", depending on function.

Inside [[EDF]], a [[thingtype]] can get an ACS spawn ID by setting its '''acs_spawndata { num }''' value. It must be in the 1-255 range.