Added - `Backtracking` and `IndexBasedBacktracking`
0.7.0
Added - property `terminal_tuple` and `non_terminal_tuple` to `ContextFreeGrammar`
0.6.0
Added - property `context_free_grammar_rule_tuple` to `ContextFreeGrammar`
0.5.0
Added - chomksy submodule with support for context-free grammar
Changed - from `expenvelope.Envelope` to `mutwo.core_events.Envelope`
Removed - `expenvelope` dependency
0.4.0
Changed - Apply refactor from first plugin to namespace package plugin structure
0.2.0
Changed - applied movement from music related parameter and converter modules (which have been moved from [mutwo core](https://github.com/mutwo-org/mutwo) in version 0.49.0 to [mutwo.ext-music](https://github.com/mutwo-org/mutwo.ext-music))