fixed integration tests and removed unimplemented tabs
started with preferences editor

added dummy view that has a wrench as icon. The wrench.png has been
copied from slic3r sources.
preferences editor: dynamic change of form page

dummy panel adds just a box with dummy label
started to implement panels of general printer settings
extracted SettingsBoxPanel for boxes on the left side
bind current printer setting to editing form and ...

fix it tests (autorun in MainFrame).