1. Split Linedef Edit Form into 2 versions: one for Doom/Hexen, and the other for UDMF map format.
Spoiler:2. Linedef Edit Form, UDMF: added less annoying warning about missing activation flags (no checks if an action actually requires activation yet...)
Spoiler:3. Flags Form: added special handling for flag with zero value (mostly to handle "Vavoom" 3d floor flag properly).
So, ummm... let me know how this stuff works and how many things I broke this time
Download GZDoom_Builder-r2041.7z