#4457 - line opacity added for Locus and slider changed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35345 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4457 - Segment, Ray, PolyLine and Poligon has line opacity

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35346 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
LineOpacity key (temporary)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35347 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.299.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35348 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e