* Convert from out-of-process applet to in-process applet: - Do not call methods that change the global state, such as g_log_set_default_handler(). - Refactor src/Makefile.am, reuse some flags for different builds. - Drop the D-Bus services files, no longer needed. * Do not call panel_applet_set_background_widget(), this call is not needed with libpanel-applet ≥ 3.16. * Update the install files according to in-process switch. * Remove the apport hook, not useful without log files.