Library work

This request contains the commits from the past two weeks containing a start of the "librarisation" of CCExtractor. The .sln has 3 extra filters for 3 libraries (common, decoders, encoders) and files have been renamed. Furthermore methods have been moved, header files organised, and most importantly for the future library: files do not longer depend on ccextractor.h. There is still quite a lot of work that needs to be done: more files should be decoupled from ccextractor.h, and there should be a uniform way of accessing the libraries. This will come in future commits/pull requests. For now, there's a start that doesn't break anything.