Enhanced swiftlint rules

[tonystone]

Update .swiftlint.yml

• Adding the playground code for linting.
• Opening up comma_after_identifier to all text (removed match_kinds).
• Disabling rules that conflict with tests.
• Updating comma_after_identifier making it specific to certain types.
• Adding comma_after_identifier_comment to catch special cases in comments when specifying number like 10,000 which require a comma with no spaces.
• Adding bracket custom_rule.
• Adding empty_brackets rule to enforce {} brackets when there is no body.

Misc

• Updating all files to conform to new swiftlint rules.

[tonystone]

Current coverage is 97.73% (diff: 100%)

Merging #147 into master will not change coverage

@@             master       #147   diff @@
==========================================
  Files            39         39          
  Lines          2477       2477          
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
  Hits           2421       2421          
  Misses           56         56          
  Partials          0          0          

Diff Coverage	File Path
•••••••••• 100%	Sources/GeoFeatures/LinearRing+Surface.swift
•••••••••• 100%	Sources/GeoFeatures/CollectionBuffer.swift

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