Add Fuel Cell parts

• Redone parts: Fuel Cell and Fuel Cell Array
• New Parts: Monopropellant APU

Distribution/Restock/GameData/ReStock/Patches/Electrical/restock-fuelcells.cfg

@@ -0,0 +1,29 @@
+// Patches applying art changes to fuel cells
+// Contents:
+// - Fuel Cell (FuelCell)
+// - Fuel Cell Array (FuelCellArray)
+
+// Fuel Cell
+@PART[FuelCell]
+{
+  @author = Andrew Cassidy
+
+  !MODEL {}
+  MODEL
+  {
+    model = ReStock/Assets/Electrical/restock-fuelcell-radial-1
+  }
+}
+
+// Fuel Cell Array
+@PART[FuelCellArray]
+{
+  @author = Andrew Cassidy
+
+  !MODEL {}
+  MODEL
+  {
+    model = ReStock/Assets/Electrical/restock-fuelcell-radial-2
+  }
+}
+