g_type_init is deprecated in Glib 2.36
Revert "g_type_init is deprecated in Glib 2.36"

This reverts commit bc87b7b4a1b199606a29877067ae657f850f1618.
Remove deprecated call to g_type_init
Use gdk_window_get_{width,height} also in Gtk+2

It was added in Gtk+ 2.24
Gtk3: Rename callback function to reflect changed signal.
interface: Move/Add comment for each Gtk version
Remove has-seperator property
Gtk3: Fix deprecated hscale use
Fixed graph jump bug caused by label changing height
Removed unnecessary dependency on dbus-glib-1
Update autotools