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[ADD #13] WLoader has now its own commitDataSet member function which shall be used in the subclasses

[FIX] added path finding code for OSX when not using bundles. We need to add code for bundles later on as shaders will be in a different path (i.e., I guess, in Resources)

[ADD] - added further exceptions

 * all string helper functions (esp. the <<-operators) are now in string_utils since we need them here for direct access in template friend functions for templates
 * WLoaderFibers now loads fibers out of the fib file but no scalars at the moment. They are stored at the moment directly in the WLoaderFibers object which will change very soon
 * WLine and WFiber are new classes to play with in math
 * output operator for WValue (printing the components array)
 * brainlinter: shouldn't choke on missing whitespace aroung "<<" see ticket: #83
 * brainlinter: should now accept "//" comments after closing braces