Also added a script which copies all necessary files from the appropriate MSYS2/mingw64 folders to the bin folder of the install environment
Updated GTK3 NSI script
Closes#1 -> NSIS installer with long PATH names
Closes#2 -> libxml++ added
New packages added: json-glib, libxml++ and libxslt
Several packages saw a version bump.
For now I am sticking with gtk-3.14, since gtk-3.16 introduces a mandatory dependency on OpenGL through libepoxy which I still need to figure out...
