Adding Equatable for direct comparison of TinyColors

[calvintam236]

Do you think we should extends TinyColor from Equatable? Looks like a good way to compare between TinyColors.

Ref: https://pub.dev/packages/equatable

[dsyrstad]

I'd rather not bring in other dependencies.

[calvintam236]

Alternatively, we can do the hard code way (operator ==) for comparison. This way does not require any dependencies, just longer and uglier.

[dsyrstad]

I use TinyColor for color manipulation, after that it goes back into a Color so I never need to check if they're equal. I think we should keep TinyColor "tiny" and focused. Let's fix the bugs, get it to null-safety, and publish it to pub.dev.

[calvintam236]

https://github.com/bgrins/TinyColor#color-utilities

This functionality is part of the original tinycolor2 and was not ported over. This addition would be easy and simple.

[calvintam236]

Update: PR #16 implements this feature without any new dependency.