shaders: hit point only on real point size

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37698 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Change picking names

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37699 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e