HDR Demo v0.2.0: Dev Tools, Colorbanding test, HDR gallery, Monitor switching

Took some time to add some new stuff, I started on a color banding test a while ago but couldn't find time to finish it until now. 

A friend of mine has big issues with color banding on his display, but it's more the games to blame than his display. Though higher quality displays can help, HDR and awareness of it from developers helps solves these ugly banding issues. 

I also added some HDR screenshots I've taken of various games into a gallery, this will grow over time hopefully to not just include game screenshots but art as well.  This gallery also includes a heatmap to demonstrate how HDR works in these images. The shader used for this is now also included in the project files. 

Another inclusion is the display info script, this is also included in the project files.

Lastly, I received some issues from users with multiple monitors, I don't have more than one monitor so I can't test it, but the functionality has been added. Do let me know of further problems.

Oh, and while there is a "Display HDR" toggle, I disabled its function, this is because of either a bug or a flaw with my implementation. But once HDR is turned off in-game it can't be turned on again properly. I believed this would confuse users. I'll return to this issue when I get some feedback on proper implementation of this toggle.