ColorBar: change Alpha (fix)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27785 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
GeoGebraCASIntegrationTest:

Minor renaming, corrected expected result (wrong ordering), added test case for ticket #3558.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27786 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e