* 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

* Added constness to the buffers which are hold by the vertex buffer object (otherwise you cannot attach const buffers and there is no reason why this should not be possible)
* IMPORTANT: Fixed a major bug in the ACGL RenderObject which caused a wrong mapping to the array buffers! All projects should update to this newest version of ACGL!

* Fixed warnings in the NURBSCurve class and added an error message when a curve is defined with a missmatching knot vector

* Furthermore introduced a factory to register new file types (currently jpg and png).
* Added support for cube mapping

This commit closes #106, #107

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

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