Devlog for GSOC 2018 Slic3r Project

Initially, I just used a slic3r issue as a devlog, but as I have moved on to other areas of slic3r I have continued my log in other issues.

I started under the main issue for the face based rotation feature.

Then I moved on to porting 3D views to cpp as logged here.

I hit a few snags with that prevented me from making good progress so I then began working on porting tests logged here

I helped finish up two functions make_skirt and process_layer

I have been working on implementing a solution to using g2/3.