Toolbar styling (toolbar width and separator style)  (#3054)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23532 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Context menu refactoring + position of context menu (half way) (#2977)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23533 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e