Reset droid animation state in a few places

- When going offworld.
- When moving a droid into a transporter.

This prevents a somewhat uncommon case where cyborgs are walking in-place inside menu buttons, for example.

src/droid.cpp

@@ -212,6 +212,18 @@ int droidReloadBar(const BASE_OBJECT *psObj, const WEAPON *psWeap, int weapon_sl
 	return -1;
 }
 
+// Reset animation state so some units don't walk in place in the menu sometimes.
+void resetDroidAnimationState(DROID *psDroid)
+{
+	if (psDroid == nullptr)
+	{
+		return;
+	}
+
+	psDroid->timeAnimationStarted = 0;
+	psDroid->animationEvent = ANIM_EVENT_NONE;
+}
+
 void addDroidDeathAnimationEffect(DROID *psDroid)
 {
 	// DERIVED from moveCalcNormalSpeed and moveGetDroidPosDiffs:

src/droid.h

@@ -69,6 +69,8 @@ void add_to_experience_queue(int player, int value);
 // initialise droid module
 bool droidInit();
 
+void resetDroidAnimationState(DROID *psDroid);
+
 bool removeDroidBase(DROID *psDel);
 
 struct INITIAL_DROID_ORDERS

src/mission.cpp

@@ -718,6 +718,7 @@ static void saveMissionData()
 		{
 			orderDroid(psDroid, DORDER_STOP, ModeImmediate);
 		}
+		resetDroidAnimationState(psDroid);
 	}
 
 	//save the mission data

src/transporter.cpp

@@ -1047,6 +1047,9 @@ void transporterAddDroid(DROID *psTransporter, DROID *psDroidToAdd)
 		}
 		return;
 	}
+
+	resetDroidAnimationState(psDroidToAdd);
+
 	if (onMission)
 	{
 		// removing from droid mission list