main.c: Do remote command line parsing
main.c: Do remote command line parsing

Creates subclass of GApplication to override local_comman_line().
By doing this we are able to pass all command line handling to the
remote instance. Before, only commands that were not handled locally
were passed via 'command-line' signal to the remote instance.
Due to this, for example no help output that shows remotely handled options
was available.

A later implementation might be more differentiated with local and
remote handling, and pass arguments selectively.

Signed-off-by: Enrico Jorns <a2e5f936c390f36494e46e71bcfbe365bb1e8c49@pengutronix.de>

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