Adds status bar class, integrates with main window and shows scanner in-progress
Adds search engine in-progress to status bar
Merge branch 'feature/status-bar' into develop
Adds Settings class to encapsulate system-vs-user settings
Modifies settings widgets to use Settings instead of QSettings
Updates scanner, library, and search engine to use Settings instead of QSettings
Updates widgets to use Settings instead of QSettings
Added popup to notify users to restart after changing system-vs-user setting
Merge branch 'issue-4' into develop. Closes #4