Update BaseEnemyMech script to change the default faction

As part of the base enemy mech script its faction should be updated to 4
to make sure it's seen as an enemy by the client. The AgDarklingMech script
has been deleted as its functionality was essentially that of BaseEnemyMech
and thus no longer necessary.

dScripts/BaseEnemyMech.cpp

@@ -7,6 +7,14 @@
 #include "EntityManager.h"
 #include "dpWorld.h"
 #include "GeneralUtils.h"
+#include "DestroyableComponent.h"
+
+void BaseEnemyMech::OnStartup(Entity* self) {
+    auto* destroyableComponent = self->GetComponent<DestroyableComponent>();
+    if (destroyableComponent != nullptr) {
+        destroyableComponent->SetFaction(4);
+    }
+}
 
 void BaseEnemyMech::OnDie(Entity* self, Entity* killer) {
 	ControllablePhysicsComponent* controlPhys = static_cast<ControllablePhysicsComponent*>(self->GetComponent(COMPONENT_TYPE_CONTROLLABLE_PHYSICS));