Bypass emit filter ins wslidercomposed to fix issues with 1.11 skins, fixes https://bugs.launchpad.net/mixxx/+bug/1283844
Fixed growing tooltips in --developer mode, a regression from f486e97e94268971d0cbe54b4c17bacf10ec8bcb
fix test build on linux

the DirectionOption enum is part of ControlParameterWidgetConnection.
Merge pull request #182 from kain88-de/fix_test

fix test build on linux
Added ThreadCpuTimer to measure the time consumedin a thread (Linux only)
Added macro to allow switch to thread cpu time
Phantom column in library table ---(Bug #1258776) fixed

KEY_ID is only needed to cache the global key and like all internal
housekeeping variables in the database it is internal.
Import latest fixes for Kontrol X1
Import latest fixes for Kontrol F1
Adjust scratch parameters
Fixed compiling VsyncThread with Qt5
Fix compiling MixxxApplication wit Qt5
Don't hard-code LoadSelectionToGroup.  We already have a CO, [ChannelX],LoadSelectedTrack.
Remove unnecessary code which breaks compile on other than linux.

The thread cpu timer is adopted from performance timer code for
linux. There is no implementation for other platforms, but the old
functions were left around leading to duplicate symbols when linking.

Removed these and renamed 'default' dummy functions.
Removed unused function
Added Khyrul Bashar to contributor list. Thank you!
Fixed code style in EngineDelay
Removed echo from EngineDelay. Solution copied from pfl_delay.patch from Ywwg Bug #225966
Added EngineDelay for Master and Headphone output
bypass delay puffer if