Fix some safe offenses in production code

- Layout/DotPosition
- Layout/HashAlignment
- Lint/AmbiguousOperator
- Lint/RedundantSplatExpansion
- Lint/SymbolConversion
- Lint/UnusedBlockArgument
- Lint/UnusedMethodArgument
- Performance/RedundantBlockCall
- Performance/RegexpMatch
- Performance/StringIdentifierArgument
- Style/BlockDelimiters
- Style/ClassCheck
- Style/ColonMethodCall
- Style/CommentAnnotation
- Style/EachWithObject
- Style/EvalWithLocation
- Style/Lambda
- Style/MethodDefParentheses
- Style/PercentLiteralDelimiters
- Style/RaiseArgs
- Style/RedundantException
- Style/RedundantParentheses
- Style/RedundantReturn
- Style/RedundantSelf
- Style/RegexpLiteral
- Style/RescueModifier
- Style/RescueStandardError
- Style/StderrPuts
- Style/StringLiterals
- Style/SymbolArray
- Style/TrailingCommaInArrayLiteral
- Style/TrailingCommaInHashLiteral
- Style/TrivialAccessors

Also:
- Use squiggly heredocs
- Improve documentation

.rubocop.yml

@@ -24,3 +24,6 @@ RSpec/ExampleLength:
 
 RSpec/MultipleExpectations:
   Enabled: false
+
+Style/ArgumentsForwarding:
+  Enabled: false