Marcus had written up workbench style widgets inside the two external
helper programs requestchoice and executecmd. This ports the code over
to libami.
Note that there isn't a generic gadget or collection of gadgets yet -
this is purely a refactor of the code, and the upcoming commit that
migrates requestchoice/executecmd over to use them just handles them
directly via xlib like they have always done.
This adds a command to iterate over the set of windows. It's not
like alt-tab in ye olde windows world where you'd alt tab once to
switch between two windows, and then keep alt-tab'ing with alt down
to go through the window list. For now it just literally iterates
through those windows.
This makes it a lot easier to work with a large number of open
windows without having to constantly use the mouse.
