* removed unneeded includes
* moved global brightmap to GPalette
* took Build tile init code out of the FTextureManager class, because this code is not compatible with how real Build games need to go about it, making the texture manager not shareable.
* removed dependency on higher level info from the Image class.
* moved the sprite renaming out of the file system entirely into a caller-provided callback.
* renamed several functions to closer match the terms of a file system.
* moved the VM interface out of the implementation.
