Replace internal constants with package constants

[chrisdamba]

Resolves #74.

Checklist

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• Read, understood, and followed the contributing guidelines, including the relevant style guides.
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Description

What is the purpose of this pull request?

This pull request:

• Replaces the pi/2 and pi/4 internal constants with package constants.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves Update base math implementations to use package constants #74

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

No.

---

@stdlib-js/reviewers

[kgryte]

Thanks! Depending on the outcome of #76, we would need to update this PR.

[kgryte]

@Planeshifter Can we shift the discussion to the relevant RFC issue?

[Planeshifter]

Moved the comment there.

[kgryte]

Thanks!

[codecov-io]

Current coverage is 88.2371% (diff: 100%)

Merging #75 into develop will increase coverage by 0.0112%

@@            develop        #75   diff @@
==========================================
  Files          2210       2211     +1   
  Lines         29259      29287    +28   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits          25814      25842    +28   
  Misses         3445       3445          
  Partials          0          0          

Diff Coverage	File Path
•••••••••• 100%	...e_modules/@stdlib/math/base/special/atan/lib/atan.js
•••••••••• 100%	...e_modules/@stdlib/math/base/special/asin/lib/asin.js
•••••••••• 100%	...e_modules/@stdlib/math/base/special/acos/lib/acos.js

Powered by Codecov. Last update 39cfaec...0d8a16d

[kgryte]

@chrisdamba Would you be up for submitting the fourth-pi constant as a separate PR? This way we have a clean issue/PR correspondence. This PR can simply be updating packages to use said constant.

[chrisdamba]

Sure, sorry for the misunderstanding

[kgryte]

No worries! :)

[kgryte]

@chrisdamba Now that fourth-pi has landed, you should be able to clean this PR by doing a git reset --hard <commit> and making the intended changes.

[chrisdamba]

Cleaning up this PR