Suggestion: Allow style classes on objects (css classes)

[DarkTrick]

• [x] I agree to follow the Code of Conduct that this project adheres to.
• [x] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Is your feature request related to a problem? Please describe. I'd like to focus on content during diagram creation, not formatting. Currently, formatting has to be done for each individual item. This is especially a problem, when larger groups of items need to be reformatted.

Describe the solution you'd like

• I'd like the ability to assign one or more style classes (CSS classes) to items.
• I'd like the ability to provide style rules for these classes (simplest implementation: could be a simple large text area containing all rules, just like a CSS file.).

Describe alternatives you've considered I couldn't find any workaround

Additional context Add any other context or screenshots about the feature request here.

[WEGFan]

It'd be great if allowing placeholders in styles, so I can write fillColor=%bg%; if I want to change the background of a group of layers later.

[stale[bot]]

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