perf: performance improvments

- switch to BTreeMap for consistant ordering of fields (less UI updates)
- cache calls to expensive getters in the vm via witha Proxy on
  DeviceRefs
- have DeviceMixin explicitly subscribe to device property changes to
  limit updates
- split fields into seperate componate to avoid rerender of other
  components
- speedup ic10emu_wasm DeviceRef::get_slots by only calling serde once.

Signed-off-by: Rachel Powers <508861+Ryex@users.noreply.github.com>

www/src/ts/virtual_machine/stack.ts

@@ -37,6 +37,7 @@ export class VMICStack extends VMActiveICMixin(BaseElement) {
 
   constructor() {
     super();
+    this.subscribe("ic", "active-ic")
   }
 
   protected render() {