[stk_browser & stk_track] Added property friction. Solved problem with defaults in exporting of materials.
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@7705 178a84e3-b1eb-0310-8ba1-8eac791a3b58
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git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@7705 178a84e3-b1eb-0310-8ba1-8eac791a3b58