Rename several classes

BaseTile,BaseTileTexture -> Tile,TileTexture
    Used in layers other than the base

LayerGroup -> Surface
    Renamed to convey that it is a member of the SurfaceCollection, and that the
    layers grouped inside are painted together (if at all)

DualTiledTexture -> SurfaceBacking
    Better conveys that this is the raster backing for a surface that can
    paint. It may be implemented with two tiled textures for now, but that isn't
    as important as its relationship to the surface.

TiledTexture -> TileGrid
    Renamed to make it more clear that it was a container of tiles, and to be
    less similar to TileTexture

Change-Id: I843f8603a2080cfe5a7313ba1c2eff10620f8aa2

0 files changed, 0 insertions, 0 deletions