Add a browser compatibility check

[NullVoxPopuli]

Check for all features used by emberclear
Class,
Async/await,
Noopener,
Wasm,
Rejuest idle callback,
Etc

[NullVoxPopuli]

Maybe I should mark which ones are required, and which are optional?

For example, in the above screen shot, Firefox focus does not support notifications. But notifications are not inherently required for the app to work

[NullVoxPopuli]

Also, there are more feature checks to add. This list may need to be collapsible