Ported survival02 to lua and added general polish

What this PR does:
- Ported survival02 to lua
- Added a lua functions for airstrikes (spyplane, parabombs)
- Added a lua function for paratroopers and replaced the "old paradrop methods"
- Removed "Facing: 0" on actors that don't use facings and "Health: 1" as it's default in all map.yaml files
- Updated the legacy map importer in order to omit above values while importing
- Reordered all named actors; now they're at the end of the "Actors" list

Still to do:
- [ ] Teach the lua-c# bridge how to use nullable types (WPos?)