* Reduce build size by removing redundant files.
22 MB of the build output was OpenTK.xml, the doc file for it.
This commit removes a lot of files like PDB files from the build output
on Release, cutting build size down to 13 MB.
Also deleted a ton of dead third party files in Third-Party, and the two
spare copies of CSFML...
* Remove more dead files.
* Even more!
* Generic repo cleanup. Removing dead files all over.
What the hell was filesystemeditor.exe supposed to be?
b9ece2888b