Added utility functions to Pybuilds for getting enabled Files and InstallDirs
Also made pybuilds stringify as their display atom
This is necessary for the AtlasGen class in openmw-mods!87 (closed), and allows for a new type of pyclass, where, rather than manually calling functions on files, you just mark the File
object with some attribute, and then the pyclass goes through and operates on those files in src_prepare, without needing to override src_prepare in the mod using the pyclass.