UDMF: Linedef executors
Based on !1621 (merged), merge that one first yada yada.
This branch adapts all the linedef executor effects (400-492) to UDMF. It doesn't adapt the triggers (3xx) yet - that's in !1625 (merged)
Based on !1621 (merged), merge that one first yada yada.
This branch adapts all the linedef executor effects (400-492) to UDMF. It doesn't adapt the triggers (3xx) yet - that's in !1625 (merged)