Made airplane touchable (#1663).

Made it untouchable in all missions.

planet/Missions.ocf/Crash.ocs/System.ocg/SeqIntro.c

@@ -23,6 +23,7 @@ func Intro_Init()
 
 	this.plane->FaceRight();
 	this.plane->PlaneMount(this.pilot);
+	this.plane.Touchable = 0;
 }
 
 func Intro_Start(object hero)

planet/Missions.ocf/Raid.ocs/System.ocg/Plane.c

@@ -10,6 +10,7 @@ func Initialize(...)
 		var closest_clonk = FindObject(Find_ID(Clonk), Find_Not(Find_Owner(NO_OWNER)), Sort_Distance());
 		SetColor(0xa04000); // Make sure it has the same color in all missions
 		Dialogue->MessageBoxAll("$PlaneBuilt$", closest_clonk, true);
+		this.Touchable = 0;
 	}
 	return _inherited(...);
 }

planet/Missions.ocf/TreasureHunt.ocs/System.ocg/SeqIntro.c

@@ -15,6 +15,7 @@ func Intro_Init(object flagpole)
 	this.plane_cat = this.plane->GetCategory();
 	this.plane->SetCategory(C4D_StaticBack);
 	this.plane->MakeInvincible();
+	this.plane.Touchable = 0;
 	
 	// Pyrit the pilot
 	this.pilot = npc_pyrit = CreateObjectAbove(Clonk, 100, 100, NO_OWNER);

planet/Objects.ocd/Vehicles.ocd/Airplane.ocd/Script.c

@@ -1119,3 +1119,4 @@ local HitPoints = 50;
 local MaxContentsCount = 20;
 local MaxPassengerCount = 3;
 local Components = {Metal = 6, Wood = 4};
+local Touchable = 1;