Don't create more than one settings editor

Move app icon definition to main.cpp

Make settings editor scrollable

Make settings editor a sub window instead of a dialog

- Add CMake build type to about page and window title

Fix build

Add build system information to the about dialog

Make editing tools disabled until a document is selected

(0) -100 -30 -10 -8 +8 +10 +30 tip

mercurial