Add HAL sound device wrapper plugins. Closes #329106

Add HAL sound device wrapper plugins. Closes #329106

Original commit message from CVS:
* configure.ac:
* docs/plugins/Makefile.am:
* docs/plugins/gst-plugins-good-plugins-docs.sgml:
* docs/plugins/gst-plugins-good-plugins-sections.txt:
* docs/plugins/gst-plugins-good-plugins.hierarchy:
* ext/Makefile.am:
* ext/hal/Makefile.am:
* ext/hal/gsthalaudiosink.c: (gst_hal_audio_sink_base_init),
(gst_hal_audio_sink_class_init), (gst_hal_audio_sink_reset),
(gst_hal_audio_sink_init), (gst_hal_audio_sink_dispose),
(do_toggle_element), (gst_hal_audio_sink_set_property),
(gst_hal_audio_sink_get_property),
(gst_hal_audio_sink_change_state):
* ext/hal/gsthalaudiosink.h:
* ext/hal/gsthalaudiosrc.c: (gst_hal_audio_src_base_init),
(gst_hal_audio_src_class_init), (gst_hal_audio_src_reset),
(gst_hal_audio_src_init), (gst_hal_audio_src_dispose),
(do_toggle_element), (gst_hal_audio_src_set_property),
(gst_hal_audio_src_get_property), (gst_hal_audio_src_change_state):
* ext/hal/gsthalaudiosrc.h:
* ext/hal/gsthalelements.c: (plugin_init):
* ext/hal/gsthalelements.h:
* ext/hal/hal.c: (gst_hal_get_string),
(gst_hal_render_bin_from_udi), (gst_hal_get_audio_sink),
(gst_hal_get_audio_src):
* ext/hal/hal.h:
Add HAL sound device wrapper plugins. Closes #329106