assert no null pointer dereference
tabs are tabs and spaces are spaces

see http://ardour.org/styleguide.html #26
add square cursors (for windows)

cursor icons squared with north-west gravity.
hotspots are identical to original icons.

otherwise gdkcursor-win32 creates square cursors with
center gravity and hotspot X/Y differs.
deploy square cursors as default for windows
drop hotspot info when changing cursors.