Dvorak, Colemak, and Teensy 3.6

My fork of the keymapper project is another result of experimenting with Teensy 3.6 USB host. The keyboard remapper supports alternate keyboard mappings including QWERTY, Dvorak and Colemak. Hot keys are defined to make it easy to switch among mappings.

Both USB ports of the Teensy 3.6 are used. The host port is where the USB keyboard plus in. The device port is where the computer plugs in. The remapper reads key codes from the keyboard, swaps key codes if needed, then writes the key codes to the computer.

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