lua consolidate pcm_ functions

The way to call the pcm functions has changed
rb.pcm("option", var)
rb.pcm_set_frequency(freq) = becomes rb.pcm("pcmsetfrequency", freq)

added pcm.lua to the includes for conversion to old functions
if your script is broken by this change you simply add
`require("pcm")` to the top for the old functionality

added rb.pcm("calculatepeaks")

Change-Id: I092057b0c0b5575e567862661f122da1ca2680e8

apps/plugins/lua/rocklib_aux.pl

@@ -88,6 +88,10 @@ my @forbidden_functions = ('^open$',
                            '^playlist_(amount|add|create|start|resume|shuffle)$',
                            '^playlist_(sync|resume_track|remove_all_tracks)$',
                            '^playlist_(insert_track|insert_directory)$',
+                           '^pcm_is_(playing|paused)$',
+                           '^pcm_play_(stop|pause|lock|unlock)$',
+                           '^pcm_(apply_settings|get_bytes_waiting)$',
+                           '^pcm_(set_frequency|calculate_peaks)$',
                            '^round_value_to_list32$');
 
 my $rocklib = sprintf("%s/rocklib.c", $ARGV[0]);