Restrict experimental weapons to at 4 at max

Closes #367

src/app/components/AvailableModulesMenu.jsx

@@ -126,7 +126,7 @@ export default class AvailableModulesMenu extends TranslatedComponent {
     onSelect: PropTypes.func.isRequired,
     diffDetails: PropTypes.func,
     m: PropTypes.object,
-    shipMass: PropTypes.number,
+    ship: PropTypes.object.isRequired,
     warning: PropTypes.func,
     firstSlotId: PropTypes.string,
     lastSlotId: PropTypes.string,
@@ -134,10 +134,6 @@ export default class AvailableModulesMenu extends TranslatedComponent {
     slotDiv: PropTypes.object
   };
 
-  static defaultProps = {
-    shipMass: 0
-  };
-
   /**
    * Constructor
    * @param  {Object} props   React Component properties
@@ -159,15 +155,15 @@ export default class AvailableModulesMenu extends TranslatedComponent {
    */
   _initState(props, context) {
     let translate = context.language.translate;
-    let { m, warning, shipMass, onSelect, modules, firstSlotId, lastSlotId } = props;
+    let { m, warning, onSelect, modules, ship } = props;
     let list, currentGroup;
 
     let buildGroup = this._buildGroup.bind(
       this,
+      ship,
       translate,
       m,
       warning,
-      shipMass - (m && m.mass ? m.mass : 0),
       (m, event) => {
         this._hideDiff(event);
         onSelect(m);
@@ -255,18 +251,16 @@ export default class AvailableModulesMenu extends TranslatedComponent {
 
   /**
    * Generate React Components for Module Group
+   * @param  {Ship} ship            Ship the selection is for
    * @param  {Function} translate   Translate function
    * @param  {Object} mountedModule Mounted Module
    * @param  {Function} warningFunc Warning function
-   * @param  {number} mass          Mass
    * @param  {function} onSelect    Select/Mount callback
    * @param  {string} grp           Group name
    * @param  {Array} modules        Available modules
-   * @param  {string} firstSlotId   id of first slot item
-   * @param  {string} lastSlotId    id of last slot item
    * @return {React.Component}      Available Module Group contents
    */
-  _buildGroup(translate, mountedModule, warningFunc, mass, onSelect, grp, modules, firstSlotId, lastSlotId) {
+  _buildGroup(ship, translate, mountedModule, warningFunc, onSelect, grp, modules) {
     let prevClass = null, prevRating = null, prevName;
     let elems = [];
 
@@ -287,10 +281,12 @@ export default class AvailableModulesMenu extends TranslatedComponent {
       prevName = m.name;
       if (ModuleUtils.isShieldGenerator(m.grp)) {
         // Shield generators care about maximum hull mass
-        disabled = mass > m.maxmass;
+        disabled = ship.hullMass > m.maxmass;
       } else if (m.maxmass) {
         // Thrusters care about total mass
-        disabled = mass + m.mass > m.maxmass;
+        disabled = ship.unladenMass + m.mass > m.maxmass;
+      } else if (m.experimental) {
+        disabled = 4 <= ship.hardpoints.filter(o => o.m && o.m.experimental).length;
       }
       let active = mountedModule && mountedModule.id === m.id;
       let classes = cn(m.name ? 'lc' : 'c', {