* Refactored caed(8) to use virtual inheritance for audio
subsystem drivers.
* Reimplemented the HPI driver in 'cae/driver_hpi.cpp' and
'cae/driver_hpi.h'.
* Added 'PCM24' to the list of available formats in
'rdadmin/edit_rdlogedit.cpp' and 'rdadmin/edit_rdlogedit.h'.
* Added PCM24 support for voice tracking in
'rdlogedit/voice_tracker.cpp'.
* Added an 'RDAudioConvert::Stage3Pcm24()' method in
'lib/rdaudioconvert.cpp' and 'lib/rdaudioconvert.h'.
* Added a 'Format::Pcm24' value to the 'RDSettings::Format'
enumeration in 'lib/rdsettings.h'.
* Modified the 'RDAudioConvert' class to support generating PCM24
output in 'lib/rdaudioconvert.cpp' and 'lib/rdaudioconvert.h'.
* Modified the 'RDPlayStream' class to support playing PCM24
data in 'rdhpi/rdplaystream.cpp'.
* Modified the 'RDRecordStream' class to support capturing PCM24
data in 'rdhpi/rdrecordstream.cpp'.
* Added an 'audio_peaks_test' harness in 'tests/audio_peaks_test.cpp'
and 'tests/audio_peaks_test.h'.
* Added 'PCM24' to the list of available formats in
'rdadmin/edit_rdlibrary.cpp' and 'rdadmin/edit_rdlibrary.h'.
* Added 'PCM24' to the list of available formats in
'rdadmin/edit_decks.cpp'.
* Added PCM24 support for file importation in
'web/rdxport/import.cpp'.
* Added an 'RDCae::Pcm24' value to the 'RDCae::AudioCoding
enumeration in 'lib/rdcae.h'.
* Instrumented 'HourSelect::updateTimeData()' in
'rdairplay/hourselector.cpp'.
* Instrumented 'LogPlay::transTimerData()' in
'rdairplay/log_play.cpp'.
* Instrumented 'LogPlay::graceTimerData()' in
'rdairplay/log_play.cpp'.
* Instrumented 'RLMHost::timerData()' in 'rdairplay/rlmhost.cpp'.
* Fixed a bug in 'LogPlay::refresh()' that caused a segfault
in 'rdairplay/log_play.cpp'.
* Instrumented the 'LogPlay::refresh()' method in
'rdairplay/log_play.cpp'.
* Added an 'RDMatrix::RossNkScp' value to the 'RDMatrix::Type'
enumeration in 'lib/rdmatrix.cpp' and 'lib/rdmatrix.h'.
* Implemented a switcher driver for the Ross NK line of video
switchers via the SCP/A serial interface in 'ripcd/rossnkscp.cpp'
and 'riptcd/rossnkscp.h'.
* Added a 'RDLIBRARY.READ_ISRC' field to the database.
* Incremented the database version to 245.
* Added 'RDLibraryConf::readIsrc()' and 'RDLibraryConf::setReadIsrc()'
methods in 'lib/rdlibrary_conf.cpp' and 'lib/rdlibrary_conf.h'.
* Added a 'Read ISRCs from CD' control to the 'Edit RDLibrary' dialog
in 'rdadmin/edit_rdlibrary.cpp' and 'rdadmin/edi_rdlibrary.h'.
* Implemented the 'Read ISRCs from CD' option in the full disc
ripper in 'rdlibrary/disk_ripper.cpp'.
* Implemented the 'Read ISRCs from CD' option in the per-track disc
ripper in 'rdlibrary/cdripper.cpp'.
* Modified the definition of the 'JACK_CLIENTS.COMMAND_LINE'
field from 'char(255)' to 'text' in the database.
* Incremented the database version to 244.
* Added a 'STATIONS.HAVE_MP4_DECODE' field to the database.
* Incremented the database version to 243.
* Added a 'Capability::HaveMp4Decode' value to the
'RDStation::Capability' enumeration in 'lib/rdstation.cpp' and
'lib/rdstation.h'.
* Merged patch from Chris Smowton to enable importation of
MP4 files [GitHub pull request #000029].
* Added prerequisites for MP4 importation in 'INSTALL'.
