Make depth buffer bits configurable about silk.net

[Perksey]

This one will have to be done by the community. Please propose a PR adding the following APIs;

New Struct VideoMode

• Get-only properties for the bit depths, refresh rate, and resolution (Size)

IMonitor (and GlfwMonitor)

• Get-only property for the video mode

IViewProperties (and its inheritors)

• Get/set VideoMode property

[Pyrdacor]

I noticed that the depth buffer bits are not part of the video mode nor monitor in glfw. Moreover it is only a soft constraint. Should I add the VideoMode stuff for resolution and refresh rate and support specifying the depth buffer bits only on windows creation?

[Perksey]

Oh I just realized you should be working on the views branch as my PR has not been merged yet. Here there are already monitor APIs to some extent, but they currently do not have the bit depth properties

[Perksey]

Also change the VideoMode property to get in IViewOptions and get set in ViewOptions and WindowOptions

[Perksey]

Resolved in #102.