Feature request: instanced mesh render about magnum HOT 3 CLOSED

Sure, I currently have implementation of MultiDraw* in progress, this will come next. The builtin shaders will then also need to be updated to support instancing, I don't yet know whether to use uniform arrays or instanced attributes for per-instance data, need to research on that a bit more.

As for the glVertexAttribDivisor, I planned to have it as a new function in Mesh, rather than per-attribute option, because all attributes in given interleaved buffer will share the same divisor value. So something like this:

const UnsignedInt divisor = 1;
mesh.addVertexBuffer(vertexBuffer, 0, MyShader::Position{}, MyShader::Normal{})
    .addVertexBufferInstanced(divisor, transformBuffer, 0,
        MyShader::TransformationMatrix{}, 
        MyShader::NormalMatrix{});

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Right now i'm in a process of slowly transfering my app from OSG to Magnum, which uses instanced render combined with transform feedback at one point, so i might just implement this on my own, as it doesn't look too overcomplicated.

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Instanced drawing is done in 20df20d, vertex attribute divisor in 71a5766. Now it is also merged into compatibility branch. I also did some changes to Mesh API and MeshTools functions to make them less confusing, mainly when working with per-instance (and not per-vertex) data.

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