realsense: try with image coords

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37603 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
add non-CAS check for f(x)==g(x) before CAS check

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37604 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
realsense doesn't use mouse robot

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37605 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e