Change some shortcut keys.
On branch master, changes to be committed:
	modified:   src/mainwindow.ui
Add file for implementing better config and settings management.
On branch master, changes to be committed:
	modified:   src/Lepton.pro
	new file:   src/leptonconfig.h
Implement main config data object.
On branch master, changes to be committed:
	new file:   config/config.json
	modified:   src/generalconfig.cpp
	modified:   src/generalconfig.h
	modified:   src/leptonconfig.h