Removed CAH card files
GameChannel 4.0

Games are no longer external assemblies. This makes it so games have to be
built into the main assembly and simplifies the code a bit.
A few other minor changes and improvements were done to the API concerning the
periodic ticks. There were also a few changes that users will notice in regards
to error handling.

In time, existing games will be ported to the new system while at the same time
receiving improvements of their own.
I've neglected this project for far too long.