ToolkitRC M6 hardcase

Added an updated version with small changes to the size of the openings to make it possible to use balance plugs with a housing. Also changed the top plate design for better usability.

This is a hardcase for the ToolkitRC M6 charger. It fixes a couple of issues with the charger:
1. The cooling fan can not be blocked.
2. The crappy little foldable legs are not used anymore.
3. The touch buttons are MUCH easier to use.
4. It's more durable.
5. If you print the case in bright colors, it's easier to find if you drop it.

Print the two parts, put the charger inside and glue the parts together with just a little bit of glue.

Some of the vent holes are covered up, but the cooling seems sufficient anyway.