Added Python script to modify Qt properties

Need to test on Mac and Windows

Refs #10015
Added reset bash script for Unix systems

Needs tested on Mac

Refs #10015
Added license, added fallback to optparse

Refs #10015
Fixed formatting to be Python3 compatible

Refs #10015
Install reset scripts alongside executable

Refs #10015
Fix CMakeLists to install reset scripts properly

Refs #10015
Added Windows reset script

Refs #10015
COpy reset script to build config dir

Refs #10015
Renamed copy_python_files_to_dir cmake function

Refs #10015
Add mantid_ prefix to scripts

Refs #10015
Merge remote-tracking branch 'origin/feature/10015_settings_reset_mechanism'