Merge branch 'release-0.32.0' into develop
Minor updates to EGLplus Config

- Added 3 new attribute getters.
Added value type to OALplus device specifier range
Multiple changes in OALplus

- Added string queries to Context.
- Added an example showing the usage of string queries.
Multiple changes in OALplus

- Fixed a type in the documentation.
- Removed a const qualifier on the Source::MaxDistance setter.
Minor update in OALplus

- Removed const qualifier from the Source::Gain setter.
Minor change in OALplus

- Added static qualifier to Context::Extensions.
Documentation and minor fix in OALplus

- Fixed a bug in listener gain getter.
Update of the configure.py script

- Added support for automatic generation of man-compatible manual.
Update of the configure.py script
Re-generated the config script manual
Minor documentation update
Updates in the build system

- Reimplemented the GL context initialization library selection.
- Renamed the --use-gl-window-lib options of the configure script
  to --use-gl-init-lib
- Re-generated the config script manual and bash-completion.
Update in one of the OGLplus examples
Added EGL example harness for off-screen rendering
Minor fix in an EGLplus example
Minor documentation update in oglplus Plane
Updated the Vector Swizzle implementation

- The Swizzle classes are generated by a script now.
Documentation update in OALplus
Added a new OALplus example