The number of files in the source directory was a little bit much and just made file naming more complex than it had to be. Therefore all files were moved into subdirectories where it matters.
Filters now reside in source/filters/, Sources in source/sources/, OBS Wrappers in obs/, OBS GS Wrappers in obs/gs/, Transitions will reside in source/transitions, Graphics Helpers will be in gfx/.
There was no proper implementation for all copy and move constructors and operators before, which meant that occasionally the default behavior took over. This is not what we want, as the default behavior doesn't deal well with reference counted pointers.
Related: #32, #33
