Minor updates to the doxyfile

- Renamed the doc target to oglplus-doc.
Merge branch 'develop' into feature-oalplus
Update of documentation building

- Reorganized and updated the build system and the doxyfiles
  that guide the building of the documentation.
Merge branch 'develop' into feature-oalplus
Multiple changes

- Added a new example showing the usage of the .obj file loader.
- Updated/cleaned-up another example.
- Updated the example resources/requirements.
- Minor updates in utility scripts.
Added wrapper for glTextureView to Texture
Updated building of OALplus docs

- Updated the OALplus' doxyfile.
- Updated and added the CMakeLists.
- Added custom header/footer and .css file.
Added wrapper for glGetShaderPrecisionFormat
Multiple changes

- Added the Size function to Buffer and Bound<Buffer>.
- Fixed some problems with the doxyfiles for generating bound/*.hpp headers.
Merge branch 'develop' into feature-oalplus
Multiple changes

- Updated documentation building.
- Updated and fixed OALplus docs.
Minor documentation update

- Renamed the objects doxygen group to oglplus_objects.
Merge branch 'develop' into feature-oalplus
Updated version and changelog.
Fixed a problem with building of test fixtures

- Added a more informative message when an unsupported implementation
  of GL initialization library is chosed when building the test fixture.
Fixed a problem with building of test fixtures

- Added a more informative message when an unsupported implementation
  of GL initialization library is chosed when building the test fixture.
Removed obsolete options from Doxyfile
Merge branch 'release-0.30.0' into develop
Minor fixup in utility scripts
Minor change in the build system

- Moved the add_examples cmake function from the example dir to example/oglplus.