Keycaps: arrow, escape, debug

Based on the keycaps from @J1136_

Adjusted the base keycaps with arrows to replace the arrows.
One is flush (smooth surface) which requires AMS.
While the other has a raised surface and could be done without AMS.

You can easily create your own in Bambu Studio. 

For the debug and icon keys - it's easiest to import a SVG image into TinkerCAD and export it as STL.

Then, in Bambu Studio, click the key and “add part”