CommonGameClassFiles
UtilityClassFiles
HelperClassFiles
MiscellaneousClassFiles
GameSupportingFiles
If certain class files tie these all together or wrapp them all up for a start up game to have a lot of higher level functionality simply right off the rip.
You can call it a Engine or FrameWork or even an Api though that usually denotes that it is a direct interface for or to low level calls.
