Port over unique Zone Builder features
SRB2-specific rendering:
- NiGHTS paths
- Zoom tube sequences
- Polyobject previews
Zone Builder Unofficial features:
- Parallel/perpendicular placement modes
- Place things at vertices
- and more
Actions:
- Select non-essential vertices/lines (Classic Modes)*
- Reset actions/flags/tags*
- Select floors/ceilings (Visual Mode)
- Deselect FOF planes (Visual Mode)
- (De)select things (Visual Mode)
- Toggle invisible FOFs (Visual Mode)
Miscellaneous:
- Increase minimum thing render size*
- Change filtering on image export (perhaps as an option*)
- Look into reverting some blockmap-related "optimizations"
- Allow selecting 1-/2-sided only in Visual Mode*
Pushed to UDB:
- Add Tab to the list of special controls
- Move selection N/S/E/W (Edit Selection Mode)
- Fix "Back" option never being checked when loading default stair builder preset
- Increment angle by 5 instead of 8 in when curving linedefs
- Allow rotation actions in Edit Selection mode
* Potentially worth pushing to UDB directly