Changed - some variables in `midi_converters.constants` to `midi_converters.configurations`
Fixed - slow calculation for glissandi / pitch envelopes
0.4.0
Changed - package structure to namespace package to apply refactor of mutwo main package
0.3.0
Changed - allow endless nested sequential events (if no simultaneous events occur in between)
0.2.0
Added - support for pitch envelopes (allow glissandi now!)
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))