Basic Android / GLES support

[kvark]

Closes #160 (basic support, more fixes might be needed later on)

Note: a side effect of this PR is a requirement of GL-3.2 for the example launcher. Glutin needs to be augmented in order to make this more flexible. GFX itself can still work with GL-2.1 though.

Image from @ozkriff:

[kvark]

To make this more complete, we need GLES support to gfx_app, so that the examples (or at least some of them) could be run out of the box.

[fkaa]

@kvark does it require a new backend or can it run on the OpenGL one with Capabilities restricting it to GLES features?

[kvark]

No, it's the same backend, fortunately :)

On Jun 18, 2016, at 9:58, Felix Kaaman notifications@github.com wrote:

@kvark does it require a new backend or can it run on the OpenGL one with Capabilities restricting it to GLES features?

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[kvark]

Ok, I got the cube example working with the example launcher without any modifications now. I consider Android/ES done, at least for now. Feel free to add more features in other PRs!

[kvark]

@csherratt review again please?

[ghost]

Looks good! This looks ready to merge, if there is anything else I can put hold off.

[kvark]

@homu r=csherratt

[ghost]

@homu r+