Keyboard: Chimera LS refactor and Configurator support (#3715)

* Matrix/keymap refactor

- Deleted `KC_KEYMAP` macro
- Renamed `KEYMAP` macro to `LAYOUT_ortho_4x12`
- Default keymap updated to current QMK standards
  - #include QMK_KEYBOARD_H
  - Refactored from `KC_KEYMAP` to `LAYOUT_ortho_4x12` macro
  - `action_get_macro()` deprecated in favor of `process_record_user()`

`rules.mk` *not* updated to include `LAYOUTS = ortho_4x12` because I have no idea if and how that works on a split and/or wireless keyboard.

* readme cleanup: markdown formatting

* Add Configurator support

* added support for ortho_4x12 layout

* Macro and readme updates

Macros updated to use `KC_NO` directly.

Readme updates and cleanup.

keyboards/chimera_ls/rules.mk

@@ -46,7 +46,7 @@ F_USB = $(F_CPU)
 
 # Bootloader
 #     This definition is optional, and if your keyboard supports multiple bootloaders of
-#     different sizes, comment this out, and the correct address will be loaded 
+#     different sizes, comment this out, and the correct address will be loaded
 #     automatically (+60). See bootloader.mk for all options.
 BOOTLOADER = caterina
 
@@ -80,3 +80,5 @@ UNICODE_ENABLE = YES 		# Unicode
 # BLUETOOTH_ENABLE = yes # Enable Bluetooth with the Adafruit EZ-Key HID
 
 USB = /dev/ttyACM0
+
+LAYOUTS = ortho_4x12