[MIRROR] pai zmovement for climbing ladders, space and scaffolding (#10796)

Co-authored-by: Will <7099514+Willburd@users.noreply.github.com>
Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>

code/modules/multiz/movement.dm

@@ -255,6 +255,16 @@
 		if(T.density)
 			return TRUE
 
+/mob/living/silicon/pai/can_ztravel()
+	if(incapacitated())
+		return FALSE
+
+	if(Process_Spacemove())
+		return TRUE
+
+	if(!restrained())
+		return TRUE
+
 // TODO - Leshana Experimental
 
 //Execution by grand piano!