DRW: Add DRW_gpu_wrapper.hh

This adds wrapper classes that make it easier to use GPU objects in C++.

####Motivations:####

 - Easier handling of GPU objects.
 - EEVEE rewrite already makes use of similar wrappers.
 - There is the ongoing effort to use more C++ in the codebase
 and lans to port more engines to it.
 - The shader code refactor will make use of many UBOs with shared
 struct declaration. This helps managing them.
 - Safer handling of `TextureFromPool` which can't be bound as normal
 texture (only texture ref) and can be better tracked in the future.

####Considerations:####

 - I chose the `blender::draw` namespace because `blender::gpu` already has private classes (i.e: `gpu::Texture`).
 - Theses are wrappers that manage a GPU object internally. They might be confused with actual `Texture`. However, the name `TextureWrapper` is a bit too much verbose in my opinion. I'm open to suggestion about better name.

Reviewed By: jbakker

Differential Revision: http://developer.blender.org/D13805

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