Updating include in rpi-nix-view

Summary: We are no longer using NIXView, so we must include WKView instead

Reviewers: lmoura, sergio, hugopl

Differential Revision: http://phabricator.coderev.indt.org/D2411
Adding .arcconfig to .gitignore

Summary:
So we can have a local config for arcanist, without
git bothering to commit it

Reviewers: lmoura, sergio, hugopl

Differential Revision: http://phabricator.coderev.indt.org/D2412
First draft of QtGLView demo

A demo that uses NIX to render in a QtGLWidget

Reviewed by: Hugo Lima