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.