Simplified Mmintbox

I've loved this enclosure for an uno+1602 LCD shield with buttons but have always had to make modifications, so I'm just now getting around to publishing them.

I've removed the button component and replaced them with a built-in compliant mechanism to press the buttons. The feel isn't as good, but it's worth it for the simplification IMO.

I've also modified the enclosure screws to be the standard/ubiquitous M3 with a 5.5mm head.

I removed some fillets/chamfers for printability, but also needed to make a cutout for the power plug since it wasn't big enough/was misaligned.

I also added a hole and clamp bracket for the front so you could have wires routed outside, but secured.

Love this thing and this version is still in beta, but once finalized I'll publish a version that has a ton more space to store a relay or small components to make this an all-in-one project box for setups using this shield.