Improved Degree[] [needs backport]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23186 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Improved Degree[] [needs backport]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23187 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Splash border removed, Spinner centered

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23188 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e