DYN-4734 Contrast ratio between a group background and group text fix

[dnenov]

Purpose

This PR addresses DYN-4734 'As a Dynamo user, I want clear contrast between group background and group text'. The requirements are:

• Identify the contrast ratio between group color and group text (title, description)
• Make sure the contrast is larger than 4.5, otherwise, switch the color of the group text
  • group text color between #F5F5F5(white) and #3C3C3C(dark charcoal)

Contrast ratio test

Using this tool to measure the contrast between the #3C3C3C text color and chosen background color.

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User-facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated

Release Notes

• now measures the current group text-to-group background contrast ratio and adjusts text color according to the group background color, so good contrast is maintained
• introduced a new color (#F5F5F5 white) in the DynamoColorsAndBrushes
• will not change text on rename, as the background is consistently white during renaming

Reviewers

@reddyashish

FYIs

@Amoursol
@Jingyi-Wen

[Amoursol]

@dnenov looks awesome! Could we do one quick test with a 50% contrast color around the middle (As in close to when it switches between white and black) to check legibility?

[dnenov]

@dnenov looks awesome! Could we do one quick test with a 50% contrast color around the middle (As in close to when it switches between white and black) to check legibility?

Sure thing, I uploaded a test case in the body of the PR, I hope that's helpful.

[Mikhinja]

Not sure if the foreground color ( value ) can ever be null, but it won't hurt to do a check