780e39d4e9
Modified sprite and path code to make use of these timestamps to determine a sprite's progress along the path. Abstracted the path stuff so that paths other than line segment paths can be cleanly implemented. git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@337 542714f4-19e9-0310-aa3c-eee0fc999fb1