Changed primitive int types in the texture to the correct OpenGL types and fixed the initialization list of the jpg controller

* ShaderProgramControlFiles is similar to ShaderProgramControlAutoFiles but the files
  have to be named explicitly which makes it possible to share some shaders for different
  ShaderPrograms.
* Both ShaderProgram controllers share some code, this should get reduced by refactoring.
* ShaderProgramControlAutoFiles had a copy&paste bug

* now also updates orientation after updating local coordinate system
  (prevents ControlCamera snapping back to old pitch/yaw after manually
  setting the camera position)

Removed the Interfaces.hh and modified the AnimationEvent class to either
call function pointers or member function pointers using class templates.

[Animations] Changed data structure from vector->list
[Animations] Added function to stop a running Animation

* Added a sampling function to the nurbs that also allows for the calculation of the derivatives

* setWrap() will now only be called if a wrap value was explicitly set before
* added rare error check

* Extended RenderBufferControl accordingly

* First version of VertexArrayObjects
* added VAO related functions to the DSA extension

OpenGL object names were misleadingly named context which can be mixed up with
the OpenGL context. Object name is the correct term used in the specs.

* Reduced warnings (by adding casts, removing unused variables etc)
* Deactivated warnings inside of GLM (gcc only)
* Fixed setUniform bug where the transposed parameter for matrixes was ignored

Merge branch 'master' of ssh://beatrix.informatik.rwth-aachen.de/data/git-repository/acgl/libraries/acgl

-RenderObject now checks if a mapped attribute location is != -1 before it sets the pointer and enables the location.

* Some GL 2.1 compatibility improvements:
  * On GL 2.1 the shaderfiles are read from a different folder by default
  * 3.0+ functions are not compiled for 2.1 any more
  * The RenderObject is not 2.1 compatible, so it's not compiled for old systems
    atm. A port could be possible.
  * ACGL compiles for GL 2.1 now
* Added compile warning in case the desired OpenGL version is not defined by
  the build system (which could screw up conditional compile)
* Minor fixes

* GLEW is not core profile campatible, new ACGL::init() code tries to work around that
  NOTE: on core profile systems (like OSX 10.7 Lion) no extension will be detected by GLEW
* Added some optional error checks that helped finding compatibility errors

* improved compatibility with pure core profiles
* minor typos

* ShaderProgramControlAutoFiles now only tries to (re)load geometry and tessellation shaders if
  they are supported
* desktop support is checked at runtime, OpenGL ES does not compile support for these stages at all