Custom color support for Fundamental components

[zaheral]

Is this a bug, enhancement, or feature request?

Feature request

Describe your proposal.

We are using some Fundamental components that are supporting color changes. The problem is that they are only supporting a set of colors. It is not possible to pass custom colors (hash color codes).

Use Case: the customers are able to define their own custom colors, which should be used by these components.

These are the components, where we need the custom color support:

1. https://sap.github.io/fundamental-ngx/#/core/facets
2. https://sap.github.io/fundamental-ngx/#/core/avatar#accent-colors
3. https://sap.github.io/fundamental-ngx/#/core/object-status

Which versions of Angular and Fundamental Library for Angular are affected? Please, specify the exact version. (If this is a feature request, use current version.)

Fundamental-NGX 0.53.x

[droshev]

@zaheral How would that work for different themes(especially when it comes to accessibility and contrast)?