Case for Raspberry Pi and LifePO4wered+

This is a modification of the case that is featured here: https://www.thingiverse.com/thing:2832531

I have added a slot for the header pins, a hole to view the power status of the LifePO4wered board from above, removed the fan attachment points and changed the style of the grill. I have moved the position and size of the cutouts as well to allow better access to the power button and to correct alignment.

I have also added a logo for the LifePO4wered+ power supply. https://lifepo4wered.com/lifepo4wered-pi+.html