[FEATURE] Support 10-bit (HDR) surfaces throughout the rendering process

Currently, projectM internally uses RGB(A)8 pixel formats throughout the rendering process. Since more and more people have screen capable of displaying higher per-channel color resolutions.

While presets aren't really aware of this, it's not necessary as almost all color calculations in presets are done as floating-point values, especially in shaders. Outputting the shader results onto a 10-bit texture will automatically give smoother color gradients, making presets look better, having a higher brightness range on screens supporting it.

Render target textures created by projectM internally should ideally follow the texture format provided in the application-provided output texture/framebuffer passed to the frame render function. This is for example possible by quering the color depth of the target framebuffer attachment via glGetFramebufferAttachmentParameter() (or glGetFramebufferAttachmentParameteriv() when using GLES) and the GL_FRAMEBUFFER_ATTACHMENT_<color>_SIZE query args.

Start by tracing the frame render function and the creation of projectM's internal render-target textures. Read how the application-provided output framebuffer is handled, then examine the framebuffer attachment color-size queries for desktop and GLES paths. Done means internal textures follow the provided output format and support 10-bit/HDR rendering throughout the process.