Reimplement 'editorArea' to allow for a size policy.
On branch master, changes to be committed:
	modified:   src/mainwindow.cpp
	modified:   src/mainwindow.ui
Implement action to view Lepton's GitHub page.
On branch master, changes to be committed:
	modified:   src/mainwindow.cpp
	modified:   src/mainwindow.h
Implement "about" window for Lepton.
On branch master, changes to be committed:
	modified:   src/mainwindow.cpp
	modified:   src/mainwindow.h
Implement "about" window fro Qt.
On branch master, changes to be committed:
	modified:   src/mainwindow.cpp
	modified:   src/mainwindow.h
	modified:   src/mainwindow.ui