feat: Support --st-mode-active-background for operation. Fix #345

fix: Icons not working in HA 2021.11

Closes #282

fix: Clone config in editor. Fixes #233

This _should_ fix the issue with frozen objects.
After weighing the options I landed on simply JSON parse/stringify as
the config only holds JSON values and should never be able to hold
cyclic values.
If this turns out to not be correct in the future the logic should be
replaced with a library that does proper deep clone

fix: Attempt to improve editor reliability

Use a copy of this.config in valueChanged, considering the passed config
might be frozen

Ref #233

build: Disable dts build

fix: Support hiding builtin sensors

Add a show field on sensors to control hide/show, with the intention to
make this field support templates as well.

```yaml
- id: state
  show: false
```

fix: Update temperature on multiple clicks

Fixes #245

chore: Enable GH workflows on beta branch

fix: Improve editor error cases

Ref #233

fix: Remove debug build from release. HACS probably fails due to it