Mutwo.ext-core

Changed
- Renamed `add_return_option` to `add_copy_option`. Methods decorated with "add_copy_option" will return the respective object no matter whether `mutate=True` (will return the same object) or `mutate=`False` (will return new object). This allows for a more beautiful syntax.

Changed
- `start_and_end_time_per_event` property of `SequentialEvent` returns `ranges.Range` objects instead of `tuple`
- renamed `FastSequentialEventToQuantizedAbjadContainerConverter` to `RMakersSequentialEventToQuantizedAbjadContainerConverter`
- renamed `FastSequentialEventToDurationLineBasedQuantizedAbjadContainerConverter` to `RMakersSequentialEventToDurationLineBasedQuantizedAbjadContainerConverter`
- renamed `ComplexSequentialEventToQuantizedAbjadContainerConverter` to `NauertSequentialEventToQuantizedAbjadContainerConverter`
- renamed `ComplexSequentialEventToDurationLineBasedQuantizedAbjadContainerConverter` to `NauertSequentialEventToDurationLineBasedQuantizedAbjadContainerConverter`

Removed
- `mutwo.events.brackets`

Fixed
- order of time signature and grace notes within the abjad converter

Added
- `grace_notes` and `after_grace_notes` to ``NoteLike``
- `grace_notes` and `after_grace_notes` rendering in ``SequentialEventToAbjadVoiceConverter``

Removed
- `mutwo.events.general`

Changed
- give up one-argument-policy for convert method of converter classes
- ``CsoundScoreConverter`` path argument from ``__init__`` moved to ``convert``
- ``CsoundConverter`` path argument from ``__init__`` moved to ``convert``
- ``IsisScoreConverter`` path argument from ``__init__`` moved to ``convert``
- ``IsisConverter`` path argument from ``__init__`` moved to ``convert``
- ``MidiFileConverter`` path argument from ``__init__`` moved to ``convert``
- ``Loudness`` perceived_loudness_in_sone argument from ``__init__`` moved to ``convert``
- `mutwo.converters.frontends.abjad_attachments` to `mutwo.converters.frontends.abjad.attachments`
- `mutwo.converters.frontends.abjad_container_routines` to `mutwo.converters.frontends.abjad.container_routines`
- `mutwo.converters.frontends.abjad_constants` to `mutwo.converters.frontends.abjad.constants`
- return type of `process_leaf` in `mutwo.converters.frontends.abjad.attachments` from `abjad.Leaf` to `typing.Union[abjad.Leaf, typing.Iterable[abjad.Leaf]]`

Added
- `_resort` method for BracketContainer
- `__getitem__` method for BracketContainer
- `force_spanning_of_end_or_end_range` argument to TimeBracket
- `flexible_start_range` and `flexible_end_range` properties to TimeBracket
- `delay` method to TimeBracket

Changed
- OverlappingTimeBracketsError

Added
- MidiPitch
- Partial
- CommonHarmonic
- spectral module in symmetrical with TwoPitchesToCommonHarmonicsConverter

Changed
- '_translate_pitch_class_to_pitch_class_name' method of WesternPitch