Demo branch adding JSCAD type, without implementing the render

Related to #411

app/web/src/helpers/cadPackages/index.ts

@@ -1,7 +1,12 @@
+import { DefaultKernelExport } from './common'
+import type { CadPackage } from 'src/helpers/hooks/useIdeState'
+
 import openscad from './openScadController'
 import cadquery from './cadQueryController'
+import jscad from './jsCadController'
 
-export const cadPackages = {
+export const cadPackages: {[key in CadPackage]: DefaultKernelExport} = {
   openscad,
   cadquery,
+  jscad,
 }