KBDfans KBD66 Layout Additions and Refactor (#20693)

* add matrix_diagram.md

* info.json: apply friendly formatting

* add LAYOUT_66_ansi_split_space

* add LAYOUT_66_iso_split_space

* refactor default keymap

- use four-space indent
- use QMK-native keycode aliases directly
- use `enum` statement for layer names
- grid-align keycodes

* refactor ansi keymap

- use four-space indent
- use QMK-native keycode aliases directly
- use `enum` statement for layer names
- grid-align keycodes

* refactor iso keymap

- use four-space indent
- use QMK-native keycode aliases directly
- use `enum` statement for layer names
- grid-align keycodes

* change layout macro for ansi keymap

Refactors the `ansi` keymap to use the `LAYOUT_66_ansi_split_space` macro, and renames the keymap to `default_ansi_split_space`.

* change layout macro for iso keymap

Refactors the `iso` keymap to use the `LAYOUT_66_iso_split_space` macro, and renames the keymap to `default_iso_split_space`.

* add LAYOUT_66_ansi

The column for the spacebar key may be wrong; I was unable to find high-resolution images of the PCB.

* add LAYOUT_66_iso

The column for the spacebar key may be wrong; I was unable to find high-resolution images of the PCB.

* enable Community Layout support

keyboards/kbdfans/kbd66/matrix_diagram.md

@@ -0,0 +1,36 @@
+# Matrix Diagram for KBDfans KBD66
+
+```
+                                                    ┌───────┐
+                                       2u Backspace │0E     │
+                                                    └───────┘
+┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┐ ┌───┐
+│00 │01 │02 │03 │04 │05 │06 │07 │08 │09 │0A │0B │0C │0D │0E │ │0F │
+├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┤ ├───┤        ┌─────┐
+│10   │11 │12 │13 │14 │15 │16 │17 │18 │19 │1A │1B │1C │1D   │ │1F │        │     │
+├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴─────┤ └───┘     ┌──┴┐2D  │ ISO Enter
+│20    │21 │22 │23 │24 │25 │26 │27 │28 │29 │2A │2B │2D      │           │1D │    │
+├────┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴──┬───┬─┴─┐       ┌─┴───┴──┬─┘
+│30  │31 │32 │33 │34 │35 │36 │37 │38 │39 │3A │3B │3C  │3D │3E │       │3C      │ 2.25u RShift
+├────┼───┴┬──┴──┬┴───┴───┴─┬─┴───┴───┴┬──┴──┬┴───┼────┼───┼───┼───┐   └────────┘
+│40  │41  │42   │45        │48        │4A   │4B  │4C  │4D │4E │4F │
+└────┴────┴─────┴──────────┴──────────┴─────┴────┴────┴───┴───┴───┘
+┌────────┐
+│30      │ 2.25u LShift
+└────────┘
+┌─────┬────┬────┬──────────┬──────────┬────┬────┬─────┐
+│40   │41  │42  │45        │48        │4A  │4B  │4C   │ 1.5u/1.25u/1.25u/2.75u/2.75u/1.25u/1.25u/1.5u
+└─────┴────┴────┴──────────┴──────────┴────┴────┴─────┘
+┌────┬────┬────┬────────────────────────┬────┬───┬────┐
+│40  │41  │42  │??                      │4A  │4B │4C  │ 1.25u/1.25u/1.25u/6.25u/1.25u/1u/1.25u
+└────┴────┴────┴────────────────────────┴────┴───┴────┘
+┌────┬───┬────┬────────────────────────┬────┬────┬────┐
+│40  │41 │42  │??                      │4A  │4B  │4C  │ 1.25u/1u/1.25u/6.25u/1.25u/1.25u/1.25u
+└────┴───┴────┴────────────────────────┴────┴────┴────┘
+┌─────┬─────┬───────────────────────────┬───┬───┬─────┐
+│40   │41   │??                         │4A │4B │4C   │ 1.5u/1.5u/7u/1u/1u/1.5u
+└─────┴─────┴───────────────────────────┴───┴───┴─────┘
+┌─────┬───┬───┬───────────────────────────┬─────┬─────┐
+│40   │41 │42 │??                         │4B   │4C   │ 1.5u/1u/1u/7u/1.5u/1.5u
+└─────┴───┴───┴───────────────────────────┴─────┴─────┘
+```