Plane scroller & wind/current/pusher improvements
Contains the plane scroller changes from !1528 (closed), plus various improvements made by @Nev3r.
- Adds new linedef actions 516-518, 526-528 and 536-538, for scrolling/carrying both floors and ceilings simultaneously.
- Plane scrollers, wind, current and push/pull linedefs without a tag will now affect their frontside sector.
- Additionally, checking the Effect 6 flag on these actions allows setting the scrolling/carrying/pushing speed/strength via the front X offset, instead of the linedef's length.
Edited by sphere