* Generalize trimming function to take a predicate block. Move this function to FoundationEssentials.
* Call `_trimmingWhitespaces()` instead of through CharacterSet.
* Review feedback: rename the function to whitespace from whitespaces
* Add tests
* Standarize whitespacing and remove spaces in empty line
* fix memory binding
* use `load(as:)` instead of binding memory
* Use temporary binding rather than `bindMemory`
* use `load(as:)` and `storeBytes(of:as:)` as appropriate
* use temporary binding rather than binding assertions
* add a note about index validation
* rdar://107955097 (FoundationPreview: Batch move string API (continued))
- Move localized uppercase and lowercase to FoundationLocalization
- if-def out of CharacterSet from FoundationPreview. It's not implemented at all there, and having a no-op stub is misleading
* rdar://107955097 (FoundationPreview: Batch move string API (continued))
- Move components separated by string and range of string functions
* rdar://107955097 (FoundationPreview: Batch move string API (continued))
Enable snake case options for JSON encoder and decoder. We haven't been able to enable this option because it needed `CharacterSet`, which hasn't been properly implemented for FoundationPreview. Now that we have `BuiltInUnicodeScalarSet`, which mirrors `CharacterSet`, we can switch to that and enable the options.
* rdar://107955097 (FoundationPreview: Batch move string API (continued))
- Move `StringProtocol.lineRange(for:)` and `paragraphRange(for:)` to FoundationEssentials
- Rename String+Regex.swift to RegexPatternCache.swift
- Consolidate extensions on various String family members and remove one redundant swift file
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Co-authored-by: I-Ting Tina Liu <iting_liu@apple.com>
