[Feature] playback logging from core

people don't like having to remember to run the TSR plugin so
lets meet them halfway

all tracks are added with timestamp, elapsed, length, trackname

added buffering for ATA devices

still needed:
-Done -- a plugin that parses for duplicates and reads the track info
to create the actual scrobbler log
(log can be truncated once dumped)
this should allow you to run the plugin at leisure

later I'd like to expand this logging to allow
track culling based on skipped songs..

remove the TSR plugin as hard disk no longer need to use it

Change-Id: Ib0b74b4c868fecb3e4941a8f4b9de7bd8728fe3e

apps/settings_list.c

@@ -2314,6 +2314,7 @@ const struct settings_list settings[] = {
     "auto,headphone,lineout", hp_lo_select_apply, 3,
     ID2P(LANG_AUTO), ID2P(LANG_HEADPHONE), ID2P(LANG_LINEOUT)),
 #endif
+    OFFON_SETTING(0, playback_log, LANG_LOGGING, false, "play log", NULL),
 };
 
 const int nb_settings = sizeof(settings)/sizeof(*settings);