Added the Sphere<T> template.
Merge branch 'release-0.37.0' into develop
Merge branch 'develop' of github.com:matus-chochlik/oglplus into develop
Updated the BoundingSphere function of shapes

- Replaced the Vector<T,4> by Sphere<T> as the type to store
  the bounding sphere in the shape loaders/generators.
Update of the news feed source
Added the Group<Object> template

- Also added its specialization for Buffer which supports glBindBuffersBase.
Added support for multibind to Texture and Sampler

- Added/updated the multi-bind functions to TextureOps, SamplerOps
  and BufferOps.
- Added/updated specializations of Group<> and Array<> for Texture, Sampler
  and Buffer.
Merge branch 'develop' of github.com:matus-chochlik/oglplus into develop
Added a new OGLplus example
Update of README
Added the DSAFramebufferEXT class
Added the DSARenderbufferEXT class

- Also removed const qualifiers from some modifying functions
  of DSAFramebufferEXT.
Multiple changes

- Updated the implementation of EXT_dsa object wrappers.
- Updated Managed<Object> to be compatible with DSA*EXT objects.
Added solution folders to the build system
Multiple changes

- Added the forwarding headers for DSA Texture, Buffer, Renderbuffer
  and Framebuffer.
- Updated the DSA object wrappers.
- Updated one of the examples to show the usage of the DSA objects.
Updates and fixes in the DSA object wrappers
Removed the Storage functions from DSABufferEXT
Update of the direct state access objects

- Added the wrappers for vertex array and vertex attribute functions from
  EXT_direct_state_access.
- Added the forwarding headers and the DSAVertexArray and DSAVertexArrayAttrib
  classes.
- Updated one of the OGLplus examples to show the new features.
Started release-0.38.0
Fixed invalid definition of Target in Sampler