Some improvement with submenu opening + some cleaning. (#4134)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@32604 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
I removed the stylebar from Algebra View -> should not be visible for SMART!
Changed the triangle-icon for PopupMenuButton

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@32605 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e