calendar: allow custom events to override symbol class

[Antra]

Adds an optional symbolClassName property to calendar custom events.

When specified, the custom event's symbol class takes precedence over the calendar-level symbolClassName. If it isn't specified, the existing calendar configuration/default behavior is preserved.

For example:

{ keyword: "Tesla", symbolClassName: "fab fa-fw fa-", symbol: "tesla", color: "Blue" }

Added an E2E test covering a custom event with a custom symbol class.

Also verified the Tesla icon works in a real MagicMirror installation.

[sdetweil]

Nice..

on the testcase, it tests that the override works, but doesn't test that it is not applied when not matched.
could you add that to the test.

not in this PR, but would you create a PR for the documentation too?

[Antra]

@sdetweil Good point! I’ve added the negative case using the existing CustomEvent/dice example, so the test now verifies that the custom symbolClassName is only applied to matching events.

I'll create a separate PR for the documentation.

[sdetweil]

Thanks

[sdetweil]

Awesome. Thanks

[Antra]

There is a PR in the documentation repo now as well:
MagicMirrorOrg/MagicMirror-Documentation#408

[KristjanESPERANTO]

Thanks @Antra 😃