[BookmarksTreeView] Show focus on whole row, not each column separately
[ListItems] Fixed drawing of ListItems with Qt5 Fusion style
[Bookmarks] Improved drawing of separator

Instead of QFrame::Line, use actual ToolbarSeparator.
Also add separator into toolbar for default bookmarks.json
[Json] Implement bool values

This fixes expanded state with QScriptEngine Json parsing
[Preferences] Update default settings on some options

TabsOnTop: Enabled by default
DontLoadTabsUntilSelected: Enabled by default
AfterLaunch: Restore session is now default