folder rename: audio_renderer_alsa -> pcm_renderer_alsa

--HG--
rename : plugins/audio_renderer_alsa/Makefile.am => plugins/pcm_renderer_alsa/Makefile.am
rename : plugins/audio_renderer_alsa/configure.ac => plugins/pcm_renderer_alsa/configure.ac
rename : plugins/audio_renderer_alsa/src/Makefile.am => plugins/pcm_renderer_alsa/src/Makefile.am
rename : plugins/audio_renderer_alsa/src/ar.c => plugins/pcm_renderer_alsa/src/ar.c
rename : plugins/audio_renderer_alsa/src/ar.h => plugins/pcm_renderer_alsa/src/ar.h
rename : plugins/audio_renderer_alsa/src/arprc.c => plugins/pcm_renderer_alsa/src/arprc.c
rename : plugins/audio_renderer_alsa/src/arprc.h => plugins/pcm_renderer_alsa/src/arprc.h
rename : plugins/audio_renderer_alsa/src/arprc_decls.h => plugins/pcm_renderer_alsa/src/arprc_decls.h
rename : plugins/audio_renderer_alsa/tests/Makefile.am => plugins/pcm_renderer_alsa/tests/Makefile.am
rename : plugins/audio_renderer_alsa/tests/check_audio_renderer.c => plugins/pcm_renderer_alsa/tests/check_audio_renderer.c
plugins folder: adjusted pcm renderer's folder name in configure.ac and Makefile.am