Fix import and export of ships with modifications, bump schema version to 4

src/app/shipyard/Constants.js

@@ -51,15 +51,19 @@ export const ModuleGroupToName = {
   bl: 'Beam Laser',
   ul: 'Burst Laser',
   c: 'Cannon',
+  ch: 'Chaff Launcher',
   cs: 'Cargo Scanner',
   cm: 'Countermeasure',
+  ec: 'Electronic Countermeasure',
   fc: 'Fragment Cannon',
+  hs: 'Heat Sink Launcher',
   ws: 'Frame Shift Wake Scanner',
   kw: 'Kill Warrant Scanner',
   nl: 'Mine Launcher',
   ml: 'Mining Laser',
   mr: 'Missile Rack',
   pa: 'Plasma Accelerator',
+  po: 'Point Defence',
   mc: 'Multi-cannon',
   pl: 'Pulse Laser',
   rg: 'Rail Gun',