new package: gtk-2.24.28 and gtk-3.14.13

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...

gtk-nsis-pack/share/icons/Adwaita/scalable/status/airplane-mode-symbolic.svg

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