Revert "Additional GameCore functionality, more items"

This reverts commit 5d597f201829986a6b7bd1d500bba5d12e7ea88b.
Revert "glDrawCell"

This reverts commit 94e5a50f38ff08548e34b279f657ea20269f39e3.
Revert "Revert "Additional GameCore functionality, more items""

This reverts commit f42dc3f3f84a524e09b94525615e50482dee9c9c.