Pascal Precht a3525c63e3 feat(StatusIconTabButton): introduce image loading state and fallback
This commit introduces a loading indicator for cases where `icon.source`
is set (a custom image/icon) to improve UX of the component.

It also falls back to a letter identicon in case loading the image source
wasn't successful.

Usage:

```
StatusIconTabButton {
    icon.source: "SOME URL THAT CAN'T BE RESOLVED"
    icon.color: "red" // in case fallback is used, icon.color will be gray by default
    name: "Some channel" // used to generated letter identicon as fallback
}
```

Closes #37
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