Merge work from Stephan Arts <stephan@xfce.org> (Bug #4065)

Makefile.am

configure.ac.in

settings-dialogs/Makefile.am

settings-dialogs/Makefile.in

settings-dialogs/tweaks-settings.c

settings-dialogs/workspace-settings.c

settings-dialogs/xfwm4-dialog.glade

settings-dialogs/xfwm4-dialog_glade.h

settings-dialogs/xfwm4-settings.c

settings-dialogs/xfwm4-settings.desktop

settings-dialogs/xfwm4-settings.desktop.in

settings-dialogs/xfwm4-tweaks-dialog.glade

settings-dialogs/xfwm4-tweaks-dialog_glade.h

settings-dialogs/xfwm4-tweaks-settings.desktop

settings-dialogs/xfwm4-tweaks-settings.desktop.in

settings-dialogs/xfwm4-workspace-dialog.glade

settings-dialogs/xfwm4-workspace-dialog_glade.h

settings-dialogs/xfwm4-workspace-settings.desktop

settings-dialogs/xfwm4-workspace-settings.desktop.in

src/Makefile.am