Finished some of the ToDos

The Mesh, posAccessor and vertexAttribues were only used inside the
scope of their loops and shouldn't have been sitting around in the
functions top-most scope.

For the same reasons as with the attributes, see a few commits prior for
more info.

Signed-off-by: Tobias Frisch <tfrisch@uni-koblenz.de>

The loadScene function has grown out of proportion and needs to be
refactored. As a first step, the parsing of vertex attributes has been
encapsulated into its own function.

This commit also adds the remaining PrimitiveTypes of vertex groups.

The name "print_what" is not self-explanatory...

With precise documentation about translating the glFW/OpenGL description
of sampler objects to the Vulkan description that we want.

Resolve "Doxygen: Hinzufügen der Module"

Closes #80

See merge request !66

Resolve "Complete Voxelization"

Closes #81

See merge request !68

Resolve "Mipmapping"

Closes #55

See merge request !67

Signed-off-by: Tobias Frisch <tfrisch@uni-koblenz.de>

Signed-off-by: Tobias Frisch <tfrisch@uni-koblenz.de>