Editor and tools

[Hiei-]

First version : https://mega.nz/#!8g4iDA6D!0MH6GrTbMejmX...OLjBLqYngY

Removed :
- Most items
- All NPC (and their anchors/waypoints/sounds)

I haven't touched the layout of the level yet, but I guess it's already enough to be able to try the setup of anchors and such without mixing them with the old ones.

Edit : Tried to alter the layout and not sure we can remove everything without breaking the level. Some parts can be removed fine but some others make the mission crash at startup.

I guess we'll have to wait until Alexey share a proper template or explain us how to export in the game a level created from scratch.

But for now, the first version I did is enough to try some things.