Refactor control state mixin to use new mixins

[web-padawan]

Change ControlStateMixin to use the new mixins:

• DisabledStateMixin - Implement disabled state mixin #10
• FocusVisibleMixin - Implement focus visible mixin #11

Note: this would need 0.2.0 version bump.

[Haprog]

Note: this would need 0.2.0 version bump.

Not necessarily since according to SemVer item 4:

Major version zero (0.y.z) is for initial development. Anything MAY change at any time. The public API SHOULD NOT be considered stable.

But if it feels like a minor bump makes sense, then sure we can do it.