LIMS-1432: Add shelxt downstream view

[keeble]

JIRA ticket: LIMS-1432

Summary:

Add support for shelxt downstream results.

Changes:

• add a Shelxt extension of DownStreamPlugin
• add the mapping to this plugin
• add a dc_shelxt.html
• add the accompanying javascript

(loosely based on dimple but with several differences)

To test:

• head to https://ispyb.diamond.ac.uk/dc/visit/cm37266-1/id/13371207
• confirm a list of solutions appears
• confirm a 2d molecular view appears
• confirm that map/model viewer leads to a 3d render of a molecule

I will add a screenshot once the restore database synch is run later today.

[ndg63276]

Couple of minor changes

[ndg63276]

Can we change client/src/js/modules/dc/views/mapmodelview.js like this?

         loadMaps: function() {
             this.mapsToLoad = this.downstream.get('FEATURES').MAPMODEL[1];
             this.mapsLoaded = 0
-            this.doLoadMaps(1, this.onMapsLoaded.bind(this))
+            if (this.mapsToLoad > 0) {
+                this.doLoadMaps(1, this.onMapsLoaded.bind(this))
+            }
         },

That way it doesn't try to load a map file.

[ndg63276]

LGTM