Removed patching of de::Material within the Materials subsystem and re-implemented it within the DED reader, patching the definitions.
Added: "Mods" directive from the DED 2.0 proposal to the DED parser (presently only used for Materials). I'm not sure I like "Mods" as a keyword though, we should consider some alternatives.
Updated game definitions to use the "Mods" directive.
Removed the deprecated members of de::Material which were being used as part of the patching process.
Todo: Although group-animated Materials are working, the stage-animated method isn't.
Todo: Although group-animated Materials are working, the stage-animated method isn't.