Patch 3.6a (Age of Empires II)

Changes

 * Temporarily disabled 'sn-wall-targeting-mode' that was causing some synchronization issues when the AI attacked walls.
 * Fixed an issue where villagers were sometimes stuck in building foundation by fixing the logic that tells the unit where it can go.
 * Fixed old saved games so they are now compatible with 3.6 by updating the loading save game code so it can recognize the older and current save files.
 * Fixed two campaign scenarios where the AI would resign at the start of the game in certain cases of wonder construction.
 * Fixed a scenario editor crash when generating maps repeatedly due to incorrect calculations in player counts.