Update to Oculus SDK 0.8.0.0-beta

[Squareys]

Hi @mosra !

This is an early PR to let you know I'm working on this. I actually found some old changes I forgot about in my local repository :D

TODOs:

• [x] ovr_Detect function is back
• [x] ovr_GetSessionStatus
• [x] check error enum for hidden changes (yes, there were some)
• [x] update cmake modules in examples
• [x] investigate latencyMarker flag in ovrTrackingState
• [x] ovr_ConfigureTracking is not required, but is there a use case where one would not want full tracking capabilities (just in case there is this use case, the method will be left, doc/example will be adapted)
• [x] ovrLayerHudMode
• Support for Oculus Touch will be prosponed until I can make use of it.

(those TODOs were written late at night, my appologies for anything weird that may have resulted from that.)

Greetings, Squareys

[mosra]

Oh. Wow. Slow down, I can't keep up! :)

Now I have genuine fear that we get banned from the CIs soon :D

[Squareys]

I will try to stockpile more local commits before pushing, to grant the CIs a break every now and then.

[mosra]

I'm not complaining, it's just that the AppVeyor builds seemed to take three times longer than before (12 minutes vs. 4 minutes), like if we were throttled because of excessive activity :)

[Squareys]

@mosra Once again, done from my perspective. Can potentially be merged at the same time as https://github.com/mosra/magnum-examples/pull/19 :)

[Squareys]

@mosra Hey, you're back! :D I will take some time on the changes you proposed, probably wont find time before the weekend, just FYI.

[Squareys]

@mosra Alright, I finally got around to taking care of the flaws you pointed out! :)

[mosra]

:+1: Merged.

I just rebased the commits to current master and did a single change -- removed redundant prefix from the OvrDetectResult enum. Hope that's okay.

[Squareys]

Hope that's okay.

No problem, of course, thanks!