compile error fix
Big tilemap refactor

* using assets/tilemap/tilemap_plain.json
* Tilemap now puts tiles into the same places in the tile vector as
they are in the .png. This needs further tuning to be nice to use in
the editor, but otherwise any changes to the tilemap would invalidate
the world data. Meh.
* TexManager and Tilemap return num tiles as int instead of char
* Tilemap has tile id-name mapping and string accessors
* Editor moves up/down a bit quicker
Merge branch 'master' of https://github.com/supermuumi/nultima

Conflicts:
	source/nuEditor.cpp
compile error fixes