Delete test_state_labs

don't use KissFFT on Windows. (DBraun#100)

Fix PlaybackWarpProcessor bug (DBraun#98)

* Fix PlaybackWarpProcessor bug related to using time ratio when warp is disabled.
* Add enum config for PlaybackWarpProcessor

Feature/render beats (DBraun#93)

**Minor breaking change:**
`convert_to_sec=True` kwarg has been refactored into `beats=True` everywhere.

Features:
* PlaybackWarp Processor can now take audio of a different sample rate if you specify the rate as kwarg `sr`.
* `RenderEngine.render` now has a default kwarg `beats=False`. When True, the duration is measured in beats.

Bug fixes:
* Fix looping-related bad code in PlaybackWarp Processor. The tempo won't fall out of sync now.
* Fix `fopen` issue in Ableton Clip Info (too many file opens caused a crash).

Demo:
* New `examples/dj_mixing/dj.py` for DJ transitions. Start with one song at tempo A and fade to another song with tempo B.

Feature/bpm automation (DBraun#92)

New features:
* `load_midi` and `add_midi_note` now take `convert_to_sec` as a kwarg, which is True by default. This maintains backwards compatibility. When `convert_to_sec` is False, the notes are added according to their beats, so changes to the Engine's BPM will affect the timing.
* `load_midi` has a kwarg for `clear_previous`, which defaults to True, maintaining backwards compatibility.
* RenderEngine has `remove_processor(name: str)`. If you really want to remove a processor (and break existing Python references to it), use this.
* RenderEngine's `set_bpm` can now take a numpy array and an integer PPQN. For example, if the values in the array change every PPQN samples, then the tempo change will be "on the beat."
* Any parameter's `set_automation` now works with optional second PPQN rate argument.

Bug fixes:
* Fix int cast overflow bug with playback warp processor

fix-memory-leaks (DBraun#91)

* Fix many memory leaks (Some VSTs still have minor leaks such as TAL-NoiseMaker. Others are fine (Serum)). Fix issue with load_state: Now it works because a window is created but not shown to the user. This helps Spitfire LABS work.

taking ubuntu libfaust.so from latest TD-Faust artifact (DBraun#87)

Use manylinux container to build linux PyPI wheels

version 0.6.3

Feature/UI state (DBraun#83)

New Plugin Processor tests and features:
* `open_editor()`
* `load_state(filepath: str)`
* `save_state(filepath: str)`
* `can_set_bus(inputs: int, outputs: int)`
* `set_bus(inputs: int, outputs: int)`

fix issue with playback warp processor when warping is disabled. Add …

…new function for resetting warp markers to a steady BPM. Add new function for setting warp markers to a 2D array.