Adding debug option to the winrtrunner.

Added an option that automatically enables debugging for a package with a
provided debugger. An additinal winrtrunner option was introduced to pass
arguments to the debugger.

Change-Id: I55dbc809d26748674e5633f3eb31e7a4b8963655
Reviewed-by: Andrew Knight <andrew.knight@digia.com>
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>