Basic Clueboard 66% Hotswap Layout

This is the default layout that comes flashed on every Clueboard. For the most part it's a straightforward and easy to follow layout. The only unusual key is the key in the upper left, which sends Escape normally, but Grave when any of the Ctrl, Alt, or GUI modifiers are held down.

This uses LAYOUT_66_ansi, which is compatable with the 66_ansi community layout.