First valid release of fork repo

Chore

• Refactor node module, split types into submodules
• Update to syn 2.0
• Implement config passing, and allow to emit more than one error from macro expansion.
• Make Node types clonable.
• Fix recoverable parser. Now try to recover if any sequence is incorrect.
• Bump syn_derive to 0.1.6 to avoid nightly
• Start a new version history

Documentation

• Add comparsion with syn-rsx

Features

• Remove attributes from node list, and make type guaranties that attribute will be stored only in Element
• Improve tag close handling.
• Allow parsing of invalid rust code blocks
• Add support of unqoted text.

Fix

• Refactor ToTokens implementation and node structure to contain all source tokens.
• Re-implement tree flattening.
• Reimplement transform_block and fix tests
• Attribute value parsing span
• Updated example, bench, made fragment parsing recoverable.
• Make public keyed attribute fields.
• RawText to_source implementation on stable

Refactor

• Move node.rs to separate module.

• Remove Display implementation for most of node types.

• Simlify Parse and ToToken impl, by using syn_derive.

• Refactor: remove NodeValueExpr type
  NodeValueExpr was replaced by syn::Expr in all places where expr is needed.
  For places where {code} is expected NodeBlock was used.

• Cleanup of parsing code.

• Refactor recoverable parser.

• Refactor: Remove tls context at all.
  Use RecoverableContext instead.