There was a regression in v6 where the zoom to selection toolbar
item wasn't canceling the tool when pressed and the tool was active
(it was in v5). This implements a more generic framework for canceling
tools on button presses.
Fixes https://gitlab.com/kicad/code/kicad/issues/5103
This allows for the tool framework to keep track of a universal
set of conditions for the UI state (enabled/checked/shown) for
controls of actions. It removes the need for the main menubar
menus to be CONDITIONAL_MENUs and be rebuilt on each open,
and instead makes the updates of the check and enabling of
items handled in the native wxWidgets way.
This commit switchs the 3d viewer and kicad project manager window
over to this system.