ext/wavpack/: put back wavpack - still needs porting

ext/wavpack/: put back wavpack - still needs porting

Original commit message from CVS:
* ext/wavpack/gstwavpackcommon.h:
* ext/wavpack/gstwavpackdec.c: (gst_wavpack_dec_link),
(gst_wavpack_dec_wvclink), (gst_wavpack_dec_get_type),
(gst_wavpack_dec_base_init), (gst_wavpack_dec_dispose),
(gst_wavpack_dec_class_init), (gst_wavpack_dec_src_query),
(gst_wavpack_dec_init), (gst_wavpack_dec_setup_context),
(gst_wavpack_dec_format_samples), (gst_wavpack_dec_loop),
(gst_wavpack_dec_plugin_init):
* ext/wavpack/gstwavpackdec.h:
* ext/wavpack/gstwavpackparse.c: (gst_wavpack_parse_get_type),
(gst_wavpack_parse_base_init), (gst_wavpack_parse_dispose),
(gst_wavpack_parse_class_init), (gst_wavpack_parse_src_query),
(gst_wavpack_parse_src_event), (find_header), (find_sample),
(gst_wavpack_parse_seek), (gst_wavpack_parse_init),
(gst_wavpack_parse_handle_event), (gst_wavpack_parse_loop),
(gst_wavpack_parse_change_state), (gst_wavpack_parse_plugin_init):
* ext/wavpack/gstwavpackparse.h:
put back wavpack - still needs porting