Atreus: Removed home row Shift. It's under the thumb anyway. Also replaced dual modifier keys with macro keys (cut, copy, paste, undo).
Ergodox: Made Colemak the default layer instead of Dvorak. Also began the process of bringing it in line with the Atreus layout I've been working on.
Noticeable changes since the last pull request:
* The forced NKRO mode can be easily toggled off at compile-time, to
make the firmware compatible with certain operating systems.
* The `:;` key has changed behaviour: to access the `;` symbol, the key
needs to be double-tapped, instead of shifted.
* The `=` and `\` keys were swapped, `=` moved to the home row, on both
the **base** and the **experimental** layers.
* The arrow and navigation keys were redone, they are now more
accessible, but the navigation keys require an extra tap to access.
* The **Emacs** layer is gone, replaced by a simplified
**navigation and media** layer.
* `LEAD v` types the firmware version, and the keymap version.
* On the **experimental** layer, the `L` and `Q`, and the `K` and `G`
keys were swapped.
* The **Steno** layer gained a few more `#` and `*` keys, to make it
easier on my fingers.
Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
