RenderTexture can be set to specific color attachments
Last commit reverted. that is dumb. new attempt...
Idea: addColorAttachment. Rework the additional textures
Updated doc
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Cleaned up Repo
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Added freetype license to folder "include/Burngine/extern/"
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Thanks to Laurent for his great work. See the Utf and String files.
RenderTextures can get additional attachments

Diffuse and Specular part of the deferred shading tech use a
rendertexture to be put in. the specular part is an additional
attachment. Both get applied to the final composition output of the
scenerendering.

Next: Apply all lighttypes to the new rendering tech.
More later: reconfigure shadowmapping to fit deferred shading tech
All lighttypes work!

Next: Shadow reconfiguration