Breaking changes:
* Changes to Tree: Added `meta` attribute, in addition to `data` and `children`. Line & column attributes, when using `propagate_positions`, moved to meta (i.e. `tree.meta.line`)
* Revised transformers and visitors. Added `v_args`. `inline_args` and `InlineTransformer` are now deprecated. Instead, use `v_args(inline=True)` as a decorator on transformer methods and class definition.
* Changed default Earley lexing behavior - now returns the maximum match only. The original behavior, that attempts to match all appearances of a terminal, has been moved to the "dynamic_complete" lexer. (commit 6ea4588)
* Restructured exceptions - UnexpectedInput is now superclass of UnexpectedToken and UnexpectedCharacters, all of which support the get_context() and match_examples() methods. (commit 5c6df8e)
* Columns now start at 1 (instead of 0)
* Default LALR lexer in now contextual
* Removed "scanless parsing" mode (wasn't useful)
Other changes:
* Added `%declare` directive for plugin support.
* Default extension for Lark grammars is now `.lark` (with syntax highlighting for popular editors)
* Improved error reporting
* Lots of bugfixes, better performance, and cleaner code.