drivers/tone_alarm and tune_control small improvements/cleanup

- drivers/tone_alarm: move to ModuleBase and purge CDev (/dev/tone_alarm0)
 - drivers/tone_alarm: only run on tune_control publication (or scheduled note) rather than continuously
 - drivers/tone_alarm: use HRT to schedule tone stop (prevents potential disruption)
 - msg/tune_control: add tune_id numbering
 - systemcmds/tune_control: add "error" special case tune_id
 - move all tune_control publication to new uORB::PublicationQueued<>
 - start tone_alarm immediately after board defaults are loaded to fix potential startup issues
 - for SITL (or other boards with no TONE output) print common messages (startup, error, etc)

msg/tune_control.msg

@@ -3,8 +3,29 @@
 
 uint64 timestamp     # time since system start (microseconds)
 
+uint8 TUNE_ID_STOP                 = 0
+uint8 TUNE_ID_STARTUP              = 1
+uint8 TUNE_ID_ERROR                = 2
+uint8 TUNE_ID_NOTIFY_POSITIVE      = 3
+uint8 TUNE_ID_NOTIFY_NEUTRAL       = 4
+uint8 TUNE_ID_NOTIFY_NEGATIVE      = 5
+uint8 TUNE_ID_ARMING_WARNING       = 6
+uint8 TUNE_ID_BATTERY_WARNING_SLOW = 7
+uint8 TUNE_ID_BATTERY_WARNING_FAST = 8
+uint8 TUNE_ID_GPS_WARNING          = 9
+uint8 TUNE_ID_ARMING_FAILURE       = 10
+uint8 TUNE_ID_PARACHUTE_RELEASE    = 11
+uint8 TUNE_ID_SINGLE_BEEP          = 12
+uint8 TUNE_ID_HOME_SET             = 13
+uint8 TUNE_ID_SD_INIT              = 14
+uint8 TUNE_ID_SD_ERROR             = 15
+uint8 TUNE_ID_PROG_PX4IO           = 16
+uint8 TUNE_ID_PROG_PX4IO_OK        = 17
+uint8 TUNE_ID_PROG_PX4IO_ERR       = 18
+uint8 NUMBER_OF_TUNES              = 19
+
 uint8 tune_id        # tune_id corresponding to TuneID::* from the tune_defaults.h in the tunes library
-uint8 tune_override  # if set to 1 the tune which is playing will be stopped and the new started
+bool tune_override   # if true the tune which is playing will be stopped and the new started
 uint16 frequency     # in Hz
 uint32 duration      # in us
 uint32 silence       # in us