Support latest PXT with GC (#1798)

* Enable gc and basic compilation fixes

* Add missing GC stuff

* Set microbit-dal version

* Disable jacdac in servo

* UTF fixes

* TS build fixes

* Auto-generated files update

* We only seem to have that much

* Fix for new new compiler

* Account for uninitialized scheduler

* Intialize memory allocator

* bump references

* updated package

* Set image tag, requires https://github.com/Microsoft/pxt/pull/5262

* updated project summaries

* Fixing block tests

editor/extension.ts

@@ -191,7 +191,7 @@ namespace pxt.editor {
         } else {
             const forceHexDownload = /forceHexDownload/i.test(window.location.href);
             const isUwp = !!(window as any).Windows;
-            if (Cloud.isLocalHost() && Cloud.localToken && !forceHexDownload || isUwp)
+            if (BrowserUtils.isLocalHost() && Cloud.localToken && !forceHexDownload || isUwp)
                 r = true
         }
         return r;