8-Bits Mario pipe

This is a 8-bits Mario pipe designed to be compatible with the awesome [8-bits Classic Mario by jakejake](https://www.thingiverse.com/thing:2153014).

There is a lot of Mario pipe here, but none of them match my expectation for a pixelated pipe that look nice with the pixel aspect of the 8-bits Mario.

I also added and extended stand for Jakejake's mario, that can be used to put the Mario on the floor of the pipe, and have him looks like he was jumping over the pipe.