Colorbar overlay module with more advanced features!

[rishabhshuklax]

Fixes #430

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[rishabhshuklax]

Hey @jywarren I've added the advanced features for colorbar module, if you want some other addition to this then please do tell :smile:

[rishabhshuklax]

@publiclab/is-reviewers please review this!

[gitpod-io[bot]]

[harshkhandeparkar]

I checked this in gitpod, looks like the text overlay part is not working properly.