Changed version of DSO to show AR

Used Pangolin to perform the visualizations. The main changes were made ar_dso/Pangolin/PangolinDSOViewer.cpp file

Installation

Please refer to the original repository to find the installation instructions: https://github.com/JakobEngel/dso

Reuirements

Along with all the requirements listed in the original repository, you need:

• OpenCV 3 only.

The only difference from the original repository is that this one shows the AR cubes in Pangolin visualization window.