Maybe one day I'll remember to update the README.md

This update focuses on improving the update tool and removing versioned analysis_options files.

• Add lib/analysis_options.*.yaml
• Add tool/**
• Add use_raw_strings
• Add avoid_escaping_inner_quotes
• Add avoid_redundant_argument_values
• Add leading_newlines_in_multiline_strings
• Add missing_whitespace_between_adjacent_strings
• Add no_runtimeType_toString
• Add unnecessary_raw_strings
• Add unnecessary_string_escapes
• Add unnecessary_string_interpolations
• Add use_raw_strings
• Remove auto_updater/** - the update tool was rewritten and moved to tool/**
• Remove lib/dart/dev/**
• Remove lib/dart/stable/**
• Remove lib/flutter/dev/**
• Remove lib/flutter/stable/**
• Remove avoid_annotating_with_dynamic