refs #8492 - Added stateful configuration back to server. This time it returns a SHA-256 hash of the configuration state, and is thus deterministic.
Moved tile data transformer code into renderering tile-service directory. Previous ambiguous tile data transformations and rendering value transformations are now refered to as TileTransformers and ValueTransformers. Updated respective imports. Rendering specific config is now under 'renderer' node. So support nested configuration states, query parameters are now percent encoded/decoded. Various other minor refactoring / documentation tweaks.