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
- Increased ant health on the shellmap ([click](https://github.com/abcdefg30/OpenRA/commit/f8649634aa4089708f91d745b27ad232dd76e1ae#diff-295cd72875dd7f0b58873b0f674f5c4cR1296)). They have a better chance against the allies now. :)

Still to do:
- [ ] Teach the lua-c# bridge how to use nullable types (WPos?)
- [ ] [This](https://github.com/abcdefg30/OpenRA/commit/f8649634aa4089708f91d745b27ad232dd76e1ae#diff-61cd027831d09aa05e113bf2de1593a4R145) doesn't seem to be done correctly, I'll have another look at it
- [ ] Squash the hotfix commit
Missing space after `if`.