cleaning + function renamed (updatePreview) (#4041)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31498 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3985 colorchoser update

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31499 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e