Prevent crashing when using HMR

[Swiip]

Lots of tools has Hot Module Reloading activated by default, Parcel in first.

Unfortunately, Web Component spec seems not to support any "redefining" component.

Compo should at least prevent that case and log a warning. Currently, it fails badly.

[Swiip]

Preventing redefining prevents crash but the app still doesn't work.

Something in the store or in the connected callbacks of components...