Reverted Keymap and overhauled Tap-Hold Override

- Went back to num pad
- Added function key layer, maybe I'll do override to remove a layer
- Symbol layer is tri layer
- Redid tap-hold so taps can be held for repeating keys

users/t4corun/features/oled.h

@@ -13,8 +13,9 @@
 #define OLED_RENDER_LAYER_NAME        "Layer"
 #define OLED_RENDER_LAYER_BASE        " Def "
 #define OLED_RENDER_LAYER_NAVIGATION  " Nav "
-#define OLED_RENDER_LAYER_SYMBOL      " Sym "
 #define OLED_RENDER_LAYER_NUMBER      " Num "
+#define OLED_RENDER_LAYER_SYMBOL      " Sym "
+#define OLED_RENDER_LAYER_FUNCTION    " Fun "
 #define OLED_RENDER_LAYER_CONFIG      " Cfg "
 
 void              render_crkbd_logo(void);