Use PuTTY Link under Windows
Clean unused licenses
Use Qxt::QConfigDialog for settings window
Implement general and font settings

General settings incomplete

Also changed font saving in setting file; font string used now instead of
raw QFont binary object
Larger pref view icon
Use Oxygen Icons
Implement color setting
Add _visited guard
Initialize pref pages ON STARTUP
Merge branch 'master' into preferences

Conflicts:
	src/Qelly.pro
	src/SharedPreferences.h
Adapt Qt 5 in Qxt config
Fix color well apperance
Fix pref window size
Fix crashing when SSH client path is not valid

Show a warning message box instead.
Fix font setting
Make pref window lazy-instantiated and released on close
Partial implementation of UI pref trigger
Merge branch 'master' into preferences

Conflicts:
	src/Qelly.pro
Compilation and runtime error fix
Remvoe dead code