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OpenGL/Objects now only contains wrappers of OpenGL objects, all higher-level objects are moved to OpenGL/HiLevelObjects. Also moved LocationMappings to OpenGL/Data.
OpenGL/Objects.hh still includes the high-level stuff. In the hi-level collection multiple alternative concepts can be collected to achieve similar functionality (Uniform objects instead of UniformBuffers for example) which is fine but should not lead to confusion that just the OpenGL objects in Objects/ are the main building blocks on which the HiLevelObjects/ rely on.

    * remove unused mBufferMappings
    * warn when mapping multiple locations to same attachment
    * cap size for bufferMappings at GL_MAX_DRAW_BUFFERS
    * bind FBO before validate()

The shared and weak pointers are now included via ACGL.hh, this way there is one
one central place to replace the pointers if needed (C++11, TR1, boost, own variant).
For this, they are placed in a ptr namespace so std:: (C++11) and str::tr1:: (C++98)
variants as well as boost and own implementations can all get redirected.
C++11 detection added and correct non-tr1 header include added (should make VS2010
porting easier).

This patch hopefully fixes bug #233, but now we only have static registration of file types. In the future, we may have to find another solution for dynamic file type extensions by shared libraries (IO plugins).

* move mMode fom ArrayBuffer to VAO
* add attachAllAttributes method to VAO
* allow adding VAO attributes without binding them (location == -1)
* store state of previous VAO binding in static field