v0.52.0

• Add YamlTableWriter writer class
• Add Cell class
• Add style_filter_kwargs attribute to writer classes
• Add pytablewriter.typehint module
• Add color support with style
• Make it possible to apply style filter to column separators
• Make it possible to apply part of the style filter to headers
• Make it configurable header row crosspoint characters for text format writer classes
• Make "sort_keys" not True by default #15 (Thanks to @Zackhardtoname)
• Change to convert None values for Style class constructor arguments to default values.
• Improve an error message: #26 (Thanks to @hugovk)
• Change signatures of StyleFilterFunc
• Change max_workers attribute default value to 1
• Allow non ascii characters for JSON formats
• Fix changing chars for text format tables not properly applied due to initialization order
• Fix TomlTableWriter not properly rendered when including Decimal values
• Fix from_tabledata method not properly propagate table_name when the value is None
• Fix __repr__ method of Style class
• Fix style filter to properly apply align
• Update requirements
• Minor bug fixes