Added Pointer & Geopoint support, added more features to Query

[cbaker6]

• Added Pointers and deep save of child objects
• Added full GeoPoint support along with querying based on a geopoint or proximity. Also added test cases and documentation
• Added more capabilities to Query. The Swift SDK can now do almost everything the JS SDK can do in terms of querying. Support for aggregate is still missing
• Added GeoPoint demo to playgrounds
• Bump Xcode environment in CI from Xcode 11.6 to Xcode 11.7
• Switched ParseEncoder which is a rip and mod of the JSONEncoder from open-source Swift 5.3

[codecov]

Codecov Report

Merging #21 into main will decrease coverage by 2.70%.
The diff coverage is 55.16%.

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   64.91%   62.20%   -2.71%     
==========================================
  Files          29       31       +2     
  Lines        1485     2326     +841     
==========================================
+ Hits          964     1447     +483     
- Misses        521      879     +358     

Impacted Files	Coverage Δ
Sources/ParseSwift/API/BatchUtils.swift	63.63% <ø> (ø)
Sources/ParseSwift/API/Responses.swift	60.71% <0.00%> (-39.29%)	⬇️
Sources/ParseSwift/Coding/Extensions.swift	66.66% <ø> (+33.33%)	⬆️
Sources/ParseSwift/Coding/ParseCoding.swift	87.23% <ø> (ø)
...arseSwift/Object Protocols/ParseInstallation.swift	90.99% <0.00%> (ø)
...seSwift/Object Protocols/Protocols/Deletable.swift	0.00% <0.00%> (ø)
...seSwift/Object Protocols/Protocols/Fetchable.swift	0.00% <ø> (ø)
...seSwift/Object Protocols/Protocols/Queryable.swift	0.00% <ø> (ø)
...rseSwift/Object Protocols/Protocols/Saveable.swift	0.00% <ø> (ø)
Sources/ParseSwift/Parse Types/ACL.swift	88.03% <ø> (ø)
... and 19 more

---

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[cbaker6]

@pranjalsatija can you review this?

[cbaker6]

@TomWFox I added a decent amount of documentation here, can you look it over and make any necessary changes you see?

Note that in some places, I opted to make Query and GeoPoint look more like the JS SDK instead of the obj-c one. This framework probably has more querying ability than the obj-c one now, but is still slightly behind the JS one, but I'll fix that in a different PR. Also, because of the "typeness" of Swift, I couldn't think of a good way to return standard JSON when using explain and hint when using the methods that were already in place (at least without breaking and making it look ugly). Instead, I opted to make find, first, and count have an "explainable and hintable" methods

[cbaker6]

Codecov dropped in this PR due to the addition of the new ParseEncoder. It's basically a mod of the native JSON encoder, so the components that are unit tested are the added Parse-Swift ones.

[cbaker6]

I managed to use Parse-Swift to replace the obj-c framework in one of my sample apps where objc-parse was already working great. This is how found most of the bugs.

This framework can definitely handle the basics after this PR is merged

[cbaker6]

@TomWFox I'm finished with changes/debugging. Can you review the added documentation?

[TomWFox]

Documentation proofread ✅

[TomWFox]

Btw you can't merge this because codecov/patch is a required check but I could remove this requirement or you could lower the coverage target.

[cbaker6]

@TomWFox i can lower the reqs for codecov patch in the .codecov file (I think) and then increase it on the next PR.

[TomWFox]

Sounds good.