Add an enum for the different soft_button_areas
Add an enum for the different soft_button_areas

While at it also move the enum for the soft button edges out of
is_inside_button_area() so that it can be used elsewhere too.

Signed-off-by: Hans de Goede <9fa1be1a5b5729e4c6b404f34c9ce49ff4882fd8@redhat.com>
Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>

mortehu/xf86-input-synaptics,eyko/xf86-input-synaptics,sencer/synaptics,nanderson94/xf86-input-synaptics,quadpixels/three-finger-dragging,quadpixels/three-finger-dragging,corcoran/xserver-xorg-input-synaptics,gdestuynder/xf86-input-synaptics,nanderson94/xf86-input-synaptics,jiixyj/xf86-input-synaptics,RsrchBoy/xserver-xorg-input-synaptics,jiixyj/xf86-input-synaptics,sencer/synaptics,gdestuynder/xf86-input-synaptics,Lyude/xf86-input-synaptics,corcoran/xserver-xorg-input-synaptics,RsrchBoy/xserver-xorg-input-synaptics,mortehu/xf86-input-synaptics,Lyude/xf86-input-synaptics,eyko/xf86-input-synaptics