Dialog layout
replace LogDisplay with File logger

 - added abstract logger interface
Storing log to file - initial
Reveal log file

- change log location lo application data folder
- reveal file in Finder (Explorer) implementation
Search keyword highlighter
Merge branch 'master' of https://github.com/worklist/hifi into 19463
sytle changes on log dialog
removed unused 'LogDisplay' class
Merge branch 'master' of https://github.com/worklist/hifi into 19463
possible fix for jenkins build error
Jenkins build fix
Merge branch 'master' of https://github.com/worklist/hifi into 19463
QMutex reference
changed locking to QMutexLocker
Merge pull request #1431 from stojce/19463

Code Review for Job #19463