part of strict null work

- Show feedback when action is completed
- Verbose reload action

- Exclude not supported extensions
- Show remote badge

Many `Promise.resolve(null)` should actually be `Promise.resolve(void 0)`. In other cases, we were missing a null return annotation.

ES6 promises like using undefined as their first argument instead of null. Both should behave the same behavior

In these cases, the programmer has explicitly indicated that the type should be nullable

We compile using the alwaysStrict flag so these directives are not needed

* Use detailed text for reload button in extension editor

* Fix tests

* Fix casing