Add support for the DURGOD Taurus K320 keyboard (#11399)

* Initial support for Durgod K320 with BootMagic Lite

- Adding missing files
- Add Unicode Map Support & new user keymap
- Remove personalized features from Default keymap
- Added Unicode Map to both Default and kuenhlee keymap.c
- Updated readme.md
- Added additional Fn Shortcut keys

* Additional support for Durgod K320

- Simplifying default keymap
- Renaming durgod_k320 => durgod/k320
- Removing copy of ST_NUCLEO64_F070RB from K320. Replacing with local board.h
- Adding Mac keyboard layout for K320 as alternative via Fn+F12
- Implementing Windows Key lock on K320
- Cleaning up duplicated core functionality
- Adding default_toggle_mac_windows keymap with:
  - Ability to toggle between Windows and MacOS layout
  - Mac Media Lock functionality.

* Updating K320 keymap readme

Co-authored-by: kuenhlee <eos.camera.lee@gmail.com>

keyboards/durgod/k320/keymaps/default/readme.md

@@ -0,0 +1,14 @@
+# The default keymap for Durgod Taurus K320.
+
+Layer 0 : Standard ANSI 87 Keys TKL layout (Windows)
+
+Layer 1 : Media control and Windows lock key
+- Reusing Durgod's Original Media Control for Fn + F1 ~ Fn + F7
+- Fn + Windows to toggle Windows lock key functionality
+
+## Windows key lock
+
+You can hold down Fn + Windows key to disable the Windows key while in locked mode.
+The 'Lock' LED indicates if the Windows key is locked.
+
+This is similar to the stock K320 Windows key lock functionality.