Plugins: Wrap new core plugins.

	* configure.ac: Modify the format of the plugin definitions to include
	the target .hg basename along with the plugin name because some
	plugins (like the new input-selector and output-selector plugins) use
	dashes in the plugin name while the target .hg filename generally does
	not.
	* gstreamer/src/filelist.am: Add the new funnel, inpput-selector,
	output-selector and valve core plugins.
	* gstreamer/src/Makefile.am: Adapt to the above change.

	* gstreamer/src/gst_enums.defs:
	* gstreamer/src/gst_enums.defs.patch: Update the enum defs patch and
	regenerate the enum defs file for the enums of the new plugins.

	* tools/extra_defs_gen/generate_defs_gst.cc:
	* gstreamer/src/gst_signals.defs: Add the new plugins to the extra
	defs generation utility and regenerate the extra defs file for the
	properties and signals of the new plugins.

	* tools/extra_defs_gen/generate_plugin_gmmproc_file.cc: Modified so
	that there are no build errors if a signal name of a plugin happens to
	be a C++ keyword (such as the "switch" signal of the input-selector
	plugin).