[Freeciv-Dev] get_canvas_xy and other GUI functions

[Jason Dorje Short <vze2zq63@xxxxxxxxxxx>]

There are a number of GUI functions that can be unified.  Unifying some
of them will be very good if we're to give FreeCiv the ability to handle
isometric maps.

My question is this: is it better to provide smaller patches for this,
or larger?  Each function is independent, but by providing one large
patch it would make it easier for GUI authors to confirm that the whole
thing works with their GUI (all-at-once).

jason