fixing nav mesh

Trying an entirely new layout, currently there is only mid.

hotfix, missing models

de_yokai [ver.6]

- added tunnel between mid and A (cleaning 2)
- moved banana from A to behind shed
- closed off backhall
- closed off palace to A doorway
- boarded up tunnels bridge window
- added stairs from T spawn to B
- added pathing under river bridge
- fixed lighting and water effects
- removed A crawlspace
- cleaned up before A
- added boxes behind A site and balcony room

Ver. 5 Updates:
- simplified mid
- removed path from A to tunnels
- added tunnel from mid to long B
- reworked balcony and B boost
- moved CT spawn closer to A
- removed zigzag from B
- added stairs to dragon

Updates:
- rear porch area reworked.
- removed cover spots from B site.
- added floor materials
- added custom meshes for testing
- closed off A rear entrance