Add useful Core Data extensions

[MaxHaertwig]

Checklist

• I checked the Contributing Guidelines before creating this request.
• New extensions are written in Swift 4.
• New extensions support iOS 8.0+ / tvOS 9.0+ / macOS 10.10+ / watchOS 2.0+.
• I have added tests for new extensions, and they passed.
• All extensions have a clear comments explaining their functionality, all parameters and return type in English.
• All extensions are declared as public.

[SwifterSwiftBot]

	1 Message
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[codecov]

Codecov Report

Merging #273 into master will increase coverage by 0.33%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #273      +/-   ##
==========================================
+ Coverage   54.86%   55.19%   +0.33%     
==========================================
  Files          46       47       +1     
  Lines        3292     3323      +31     
==========================================
+ Hits         1806     1834      +28     
- Misses       1486     1489       +3

Impacted Files	Coverage Δ
...s/FoundationTests/NSPredicateExtensionsTests.swift	100% <100%> (ø)
Tests/UIKitTests/UILabelExtensionsTests.swift	0% <0%> (ø)	⬆️
Tests/SwiftStdlibTests/BoolExtensionsTests.swift	100% <0%> (ø)	⬆️

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[SD10]

NSPredicate is actually a Foundation type 🤔

[SD10]

Thank you @Vyax 👍 I'd probably be more willing to accept the NSPredicate extensions and drop what pertains to Core Data. We'd need another subspec and we don't have any other Core Data extensions. TBH, I'd like to steer away from anything outside of UIKit/Foundation/Cocoa/CoreGraphics 🤔

[MaxHaertwig]

I removed the NSFetchRequest extensions and moved the NSPredicate extensions to Foundation.