Factor out a common Launcher class from start-in-Xepyhr and
start-replace that handles option parsing and launching gnome-shell,
and add options:
-v/--verbose: Unless specified, suppress most gjs debug output
-g/--debug: If specified run under gdb
--debug-command: Run under some other debugging (strace/valgrind/etc.)
Implies -g
svn path=/trunk/; revision=18