Take damage & Summon packets

Fixed some oddities with other player clients when dealing with summons
(spawning, taking damage or attacking). Fixed damage dealt to player not
apearing if the player is a GM on hiding and other players in the area
are GMs as well.

feature_list.txt

@@ -50,4 +50,5 @@ Admin/GM commands:
 Project:
 * Organized project code.
 * Highly configurable server (see server flags at ServerConstants).
+* Fixed/added some missing packets for MoveEnvironment and summons.
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