Malachite-SDR case, for "version 3" board

Changelog:
Case (top and bottom)
v3 - initial release
v4 - slight tweeks to the location of the antenna connector hole and board edge stop for better fit.

Compatibility:
This case was designed around the Malachite (Chinese clone, version 3) SDR receiver. It will NOT fit other versions due to different locations for the antenna connecor and power button.

The charge indicator is visible though the engraved line surrounding the display... the bottom of the engraved line is only 0.5mm thick where it passes over the top of the LED. The 0.5mm PLA is transparent enough that the LED is easily visible.

There are long and short versions of the knobs... use the short version if your encoders are not straight to prevent the edge of the knob from hitting the case when pressed. Use the long version (sits closer to the case) if your encoder shafts are straight.

There are three versions of the button actuator, depending on where the power button sits. The 1mm will work in eve