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/apps/multimedia-volume-control-symbolic.svg

@@ -0,0 +1,33 @@
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+        <dc:title>Gnome Symbolic Icon Theme</dc:title>
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