Copy is now opt-in
Add Copy for potential (unused) Copy types
tuple_indexing is no longer gated!
Fix WadMetadata test
Add tests to stop size regressions for wad types
Fix gl crate clash when running doctests on wad crate
Fix matrix multiplication test
Fix unused warnings for test build of game crate
Provide a Makefile for convenient testing
Merge pull request #14 from Ryman/master

Rustup & Fix tests