- Update to 7.6.0
+ Framework:
* Added `Mlt::Animation::next_key()` and `previous_key()` with
error checking.
* Fixed the `moduledir` and `mltdatadir` variables in the
pkg-config file.
* Removed calling `setlocale()` in `mlt_factory_init()` (moved
to `melt` option `-setlocale`).
* Added `mlt_properties_copy()` and `Mlt::Properties::copy()`.
* Changed some primarily internal property names to consolidate
on "consumer."
as a prefix convention for all consumer properties copied to
`mlt_frame`s.
* Added consumer property `deinterlacer` to replace deprecated
`deinterlace_method`.
* Fixed full range color from producer to consumer.
* Added `mlt_slices_size_slice()` helper function.
* Fixed choppy playback due to large values in `frame_rate_num`
or `frame_rate_den` in `mlt_consumer`.
* Added performance optimization for a single slice in
`mlt_slices`.
+ Modules:
* Added `audiolevelgraph` video filter to the `qt` module.
* Added property `segment_gap` to the `audiospectrum` video
filter.
* Added `segments` property to the `audiolevelgraph` and
`audiospectrum` filters.
* Fixed loading image sequence with extended UTF-8 characters
in the name of a folder for the `qimage` producer.
* Fixed a crash in `avformat` producer if the `rotate` property