Fix some minor bugs.  Edit theme.
On branch master, changes to be committed:
	modified:   config/themes/defaultTheme.css
	modified:   src/leptonlexer.cpp
Add some comments.  Clean up code.  Remove unnecessary/old commented-out code. Remove unused files. Modify theme slightly.
On branch master, changes to be committed:
	modified:   config/themes/defaultTheme.css
	modified:   src/Lepton.pro
	deleted:    src/editor.cpp
	deleted:    src/editor.h
	modified:   src/editortabbar.cpp
	modified:   src/editortabbar.h
	modified:   src/generalconfig.cpp
	modified:   src/generalconfig.h
	modified:   src/leptonlexer.cpp
	modified:   src/leptonlexer.h
	modified:   src/mainwindow.cpp
	modified:   src/mainwindow.h
	modified:   src/scintillaeditor.cpp
	modified:   src/scintillaeditor.h
	deleted:    src/syntaxhighlighter.cpp
	deleted:    src/syntaxhighlighter.h