1.29.0

• new lint: dangling_library_doc_comments
• fix no_leading_underscores_for_local_identifiers to not report super formals as local variables
• fix unnecessary_overrides false negatives
• fix cancel_subscriptions for nullable fields
• new lint: collection_methods_unrelated_type
• update library_names to support unnamed libraries
• fix unnecessary_parenthesis support for as-expressions
• fix use_build_context_synchronously to check for context property accesses
• fix false positive in comment_references
• improved unrelated type checks to handle enums and cascades
• fix unnecessary_brace_in_string_interps for this expressions
• update use_build_context_synchronously for BuildContext.mounted
• improve flutter_style_todos to handle more cases
• fix use_build_context_synchronously to check for BuildContexts in named expressions
• fix exhaustive_cases to check parenthesized expressions
• performance improvements for:
  • avoid_null_checks_in_equality_operators
  • join_return_with_statement
  • recursive_getters
  • unnecessary_lambdas
  • diagnostic_describe_all_properties
  • prefer_foreach
  • avoid_escaping_inner_quotes
  • cascade_invocations
  • tighten_type_of_initializing_formals
  • prefer_interpolation_to_compose_strings
  • prefer_constructors_over_static_methods
  • avoid_returning_null
  • parameter_assignments
  • prefer_constructors_over_static_methods
  • prefer_interpolation_to_compose_strings
  • avoid_returning_null
  • avoid_returning_this
  • flutter_style_todos
  • avoid_positional_boolean_parameters
  • prefer_const_constructors
• new lint: implicit_call_tearoffs
• new lint: unnecessary_library_directive

/cc @bwilkerson @srawlins