[Keymap] Add Draevin userspace and maps (#10581)

* Initial userspace

* DZ60 map

* Quefrency map

* Sinc map

* Set up MAKE key for all personal maps

* Light userspace cleanup

* Formatting and comments zzz...

* Licensing and userspace README

* Swap: EXTRAFLAGS -> LTO_ENABLE in userspace rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Improve KC_MAKE: KC_ENT -> \n

Co-authored-by: Ryan <fauxpark@gmail.com>

* Swap left grouping on _FN for pairs

* Add '?' -> backslash on _FN

* Remove commented code

* Organize lines in rules.mk

* Add left hand scroll keys

* Move configs to config.h

* License blitz

Co-authored-by: Ryan <fauxpark@gmail.com>

users/draevin/README.md

@@ -0,0 +1,38 @@
+# Userspace - Draevin
+
+## Notable Files
+
+- [draevin.h](draevin.h) - Standard layers, keys, and tap dance key and config for all my boards
+- [draevin.c](draevin.c) - Colemak/QWERTY switch, KC_MAKE, and Shift/CAPS TD
+- [wrappers](wrappers.h) - QWERTY, Colemak, F Row, Num Row, and `_FN` layer layout wrappers
+
+## Keymap themes
+
+Some general ideas shared between my maps
+
+- Colemak and QWERTY layouts
+  - In wrappers
+  - All are Colemak default with `CM_QW` switch
+- Nav and punctuation `_FN` layer
+  - In wrappers
+  - Right hand home arrows
+  - Pinky `HOME`/`END` for ***speed***
+  - Inner grouping symbols to decrease reach
+- Split space
+  - Left thumb `MO(_FN)` is standard, but on the wrong side in the Quefrency map (silly soldering error, but not bad enough to fix)
+    - Quefrency is still *technically* split though, right? `*<:^)`
+- Re-organized right mods
+  - Personal preference on wanting easier right thumb `CTRL`
+- Real `DEL` key
+  - I can't seem to get away from it with layering, so all my maps have a delete key
+    - Sinc/Quefrency have it in the +5 column on the right
+    - DZ60 has it in the split backspace
+- `KC_MAKE`
+
+## Keymaps
+
+- [DZ60](../../keyboards/dz60/keymaps/draevin/keymap.c)
+- [Sinc 80](../../keyboards/keebio/sinc/keymaps/draevin/keymap.c)
+- [Quefrency 65 w/ Macro](../../keyboards/keebio/quefrency/keymaps/draevin/keymap.c)
+  - Horribly under-utilized macro block because I thought I needed more keys than I actually do (so sad)
+  - Left side volume and paging rotary