Improved color blind support

[henryrobbins]

• Color blind safe color palette for 2D constraint lines
• Resolved simplex path clipping on axes
• 2D constraint thickened and dashes reduces for improved visibility

[codecov-commenter]

Codecov Report

Base: 97.52% // Head: 97.53% // Increases project coverage by +0.01% :tada:

Coverage data is based on head (b0693cf) compared to base (403375b). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #7 +/- ## ========================================== + Coverage 97.52% 97.53% +0.01% ========================================== Files 12 11 -1 Lines 1535 1543 +8 ========================================== + Hits 1497 1505 +8 Misses 38 38 ``` | [Impacted Files](https://codecov.io/gh/engri-1101/gilp/pull/7?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=engri-1101) | Coverage Δ | | |---|---|---| | [gilp/\_constants.py](https://codecov.io/gh/engri-1101/gilp/pull/7/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=engri-1101#diff-Z2lscC9fY29uc3RhbnRzLnB5) | `97.91% <100.00%> (+0.18%)` | :arrow_up: | | [gilp/\_graphic.py](https://codecov.io/gh/engri-1101/gilp/pull/7/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=engri-1101#diff-Z2lscC9fZ3JhcGhpYy5weQ==) | `91.78% <100.00%> (+0.24%)` | :arrow_up: | | [gilp/visualize.py](https://codecov.io/gh/engri-1101/gilp/pull/7/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=engri-1101#diff-Z2lscC92aXN1YWxpemUucHk=) | `97.93% <100.00%> (ø)` | | | [gilp/\_\_init\_\_.py](https://codecov.io/gh/engri-1101/gilp/pull/7/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=engri-1101#diff-Z2lscC9fX2luaXRfXy5weQ==) | | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=engri-1101). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=engri-1101)

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[henryrobbins]

BEFORE: AFTER:

[henryrobbins]

This effort was guided using the Coblis Color Blind Simulator. Example images shown below.

BEFORE:

AFTER: