Design changes for Android

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26743 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for #3457

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26744 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Removed dead code

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26745 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
OS dependent LookAndFeel for icons

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26746 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
OS dependent LookAndFeel for icons - update

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26747 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e