BlockUnitTiles Method

  // Makes tiles populated by units unwalkable, so they cannot be moved to, or stopped on
	void BlockUnitTiles() {

		// If the current unit is a User unit, and moving
		if (userUnits.Contains(units[currentUnitIndex]) && units[currentUnitIndex].moving) {
			// For every unit
			foreach(Unit u in units) {
				// If the unit is not the current unit
				if(u != units[currentUnitIndex])
					// Set the walkable bool on the node of the populated tile to false
					u.currentTile.node.walkable = false;
			}
		}
		// If the unit has finished movement
		if (units[currentUnitIndex].moved) {
			// For every unit
			foreach(Unit u in units) {
				// Set the walkable bool on the node of the populated tile back to true
				u.currentTile.node.walkable = true;
			}
		}
	}