Added support for check groups to the track exporter. Now more
than one (e.g.) lap counting line can be defined (the one based on quads will always be there). So crossing any of those lines will trigger new lap, and they all will be activated etc from check lines. git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@6162 178a84e3-b1eb-0310-8ba1-8eac791a3b58
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