* Revamp replicaJunction keymaps
Updates both the replicaJunction Ergodox and Atreus keymaps and moves
most of the logic into a new user directory.
* Cleanup as requested in #3589
* Slightly increased TAPPING_TERM
* Fixed typo in #pragma once
* Fix TAPPING_TERM redefined in config.h
* Add include of replicaJunction.h
Due to the tap dance references, without this include, I was getting
compiler errors about both internal QMK items like
`qk_tap_dance_state_t` and constants defined in my replicaJunction.h
file like TD_LAYER_TOGGLE.
Also remove some commented-out code that defined an enum which has since
moved to replicaJunction.h.
Removed Alt on base layer, replaced with Function layer.
Moved function keys to left hand. Added mouse keys to right hand on the function layer.
Moved middle click on gaming layer to be consistent with mouse layer.
Added macro _USER. Macro contents are not implemented yet.
* Switched Tab and Super on the default layout
* Moved Shift on Extend to pinky
* Moved Caps Lock to upper right corner
* Moved gaming toggle to avoid blocking Escape
Instead of using a thumb shift, I was given the idea of using the pinky keys as dual-role keys that also send the Shift keypress.
This gives me a Shift key on each hand again, but it will make me learn to Shift with opposite hands after all.
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.
