Memory optimisation and small fixes

Internal coding of the extended combined characters is mad more compact, making some layouts now able to load on M0 boards without causing a memory error. This requires updating both the language layout module and the common keyboard_layout module.

• Change the spanish language from "sp" to "es".
• Add £ to the mac fr keyboard.
• Change BACKSLASH in German Keycode to match the ß key.
• Add ESZETT to German Keycode (instead of LEFT_BRACKET).
• Change Circumflex to uppercase in hu Keycode.

Languages included:

• Windows
  • Portuguese (Brazil)
  • Czech CZ and CZ1
  • Danish
  • Dvorak
  • French
  • German (DE)
  • Hungarian
  • Italian
  • Polish
  • Spanish (ES)
  • Swedish
  • Turkish (TR)
• MacOS
  • French