libgpaste-applet: add header

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
legacy-applet: use GPasteAppletHeader

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
libgpaste-applet: add footer

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
legacy-applet: use GPasteAppletFooter

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
post branch version bump

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
gnome-shell: bump to 3.11.90

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>