* Refreshed title bar for all Dialogs and MainFrame
* Refreshed header of the DataViewCtrl and ListView
* Refresh tooltips
* Redraw SpinCtrls
* Use system menu with is colored in respect to the color mode
* Preferences: Added parameter "Use system menu for application" and moved to the "Dark mode" tab with "Enable Dark mode parameter"
The wxString saga continues. wxWidgets 3.0 don't have the wxString::FromUTF8(const std::string&) overload, we must use the GUI::from_u8 helper
Also wxWidgets 3.0 don't allow to disable wxString->const char* conversion, so calling show_info(wxWindow*, wxString, const char*) was ambiguous
Several includes moved around
Removed libslic3r from the default include paths for all modules but
libslic3r. Now headers from libslic3r need to be included with an
explicit path (libslic3r/libslic3r.h etc)
Split the localization macros into I18N.{cpp,h}
