On one hand, getopt (in particular the -o suboption syntax) sucks on the
server side, and on the client side we would like to avoid the glib
dependency. We can roll out own option parser and solve both problems
and save a few lines of code total.
Remove all unneeded resizor features, and add the feature why clickdot
exists: put a visible marker to exactly where mouse was clicked.
This app can be used to check input coordinate transformations in a
compositor.
Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>