New Relation Tool: adding checking orthogonality for segments

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37044 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #4426: Quick solution for input box length in case of columns=1 or near (this should be enhanced later by changing the constant 0.83 for other sizes, and maybe we can increase the input box margins by one pixel now)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37045 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e