LCD2004_Adapter

This is an adapter to connect the DZ2004A-V1.0 LCD (Geeetech Prusa i3 pro B display) to the BIGTREETECH SKR E3 DIP V1.1 main board (LCD port). This adapter is necessary because:
- The wiring of the LCD connectors on the display and the main board are different. The LCD2004 adapter connects the correct traces to make the display work again.
- The encoder isn't used anymore. The LCD2004 adapter is adding 5 push buttons as replacement for the encoder. The principle is inspired by the Zonestar LCD.

Limitations:
The encoder is out of service. This isn't a big deal, because it wasn't used that often because Octoprint is used most of the time to control the printer. So the 5 button keypad seemed to be good enough.

### Housing
Print the following parts:
- 1x Keys_Housing.stl
- 1x Key_Back.stl and Key_Back_Icon.stl in one part
- 1x Key_Enter.stl and Key_Enter_Icon.stl in one part
- 1x Key_Home.stl and Key_Home_Icon.stl in one part
- 2x Key_Up_Down.stl and Key_Up_Down_Icon.stl in