Release v1.2.6

Core
 - Release v1.2.6
ALSA Control (alsactl)
 - alsactl: fix the check for additional elements
 - alsactl: suppress no device 'errors' for UCM
ALSA RawMidi Utility (amidi)
 - amidi: remove unused variable
 - amidi: add timestamp option for dump
alsa-info.sh
 - alsa-info.sh: Fix alsa-usbstream.tmp test
alsaloop
 - alsaloop: Support "Playback Pitch 1000000" rate shift
 - alsaloop: Renamed field capt_pitch to ctl_pitch
 - alsaloop: fixed parsing value 'auto' of option 'sync'
 - alsaloop: added option prateshift for PLAYSHIFT ctl elem used in PLAYSHIFT
 - alsaloop: Adding openctl_elem debug log
 - alsaloop: Support "Capture Pitch 1000000" rate shift
alsamixer
 - alsamixer: fix typo in man page (and/of -> and/or)
 - alsamixer: Allow setting the default background color in config
 - alsamixer: Check the availability of mouse
 - Added configuration information to manual page
alsatplg (topology)
 - topology: fix compilation for older alsa-lib
 - topology: change include path
 - topology: pre-processor: Add support for conditional includes
 - topology: Add option to pass pre-processor definitions
 - alsatplg: use standard include/asoundlib.h instead direct headers
 - topology:pre-process-object: merge object config with parent object config
 - pre-process-object: set tlv name if config exists already
 - pre-process-dapm: add data section for kcontrols
 - topology: pre-processor: fix typo in pre_process_config()
 - topology: pre-process-object: dont create if section already exists
 - pre-process-object: skip parent update if parent is NULL
 - pre-process-dapm: fix source and sink for DAPM routes
 - topology: pre-process-object: Add support for pre-process objects with no builder
 - topology: pre-process-dapm: update automatic attributes for buffer
 - topology: pre-process-object: add support for updating automatic attributes
 - alsatplg: do not do NULL check for string arrays
 - alsatplg: fix memory-leak in tplg_construct_object_name()
amixer
 - amixer: print help and add doc for 'sevents' and 'events' commands
aplay/arecord
 - aplay: Fix out-of-bound access in stereo VU meter drawing
 - aplay: Handle upper bound in peak calculations
 - aplay: Don't pass most negative integer to abs() in peak calculations
 - aplay: Handle 16bit sample negative overflow in peak calculations
 - aplay: Fix conversion of unsigned samples in peak calculation
aseqnet
 - aseqnet: add ipv6 support
 - aseqnet: use getaddrinfo() instead obsolete gethostbyname()

Signed-off-by: Jaroslav Kysela <perex@perex.cz>