- Update to version 7.2.0
  Framework:
  * Added support for `mlt_properties` as a child of
    `mlt_properties` including XML (de)serialization:
    + `mlt_property_set_properties()`
    + `mlt_property_get_properties()`
    + `mlt_properties_set_properties()`
    + `mlt_properties_get_properties()`
    + `mlt_properties_get_properties_at)(`
    + `Mlt::Properties::set()`
    + `Mlt::Properties::get_props()`
    + `Mlt::Properties::get_props_at()`
    Applications can use this to store structured data in its
    own namespace, for example "shotcut:markers". And modules
    could use this for hierarchical parameters.
  * Fixed crash in `mlt_transition` upon inserting or removing a
    track.
  * Stopped loading `mlt_profile` until needed in `mlt_chain`
    creation.
  Modules:
  * Added filter `gpstext` that is similar to `dynamictext`
    based on data in a GPX file.
  * Added speed parameter to `timer` filter.
  * Added WebP presets for `avformat` consumer.
  * Added a pixelate option to the `opencv_tracker` filter's
    `blur` property.
  * Fixed `center_bias` of `crop` filter not working with
    `use_profile`.
  * Fixed some missing RGB `mlt_image_format` renames after
    change in v7.0.0. This primarily affected presets and
    service metadata.
  * Fixed a crash when changing preview scaling in `timeremap`
    link.
  * Fixes problems due to adding redundant normalize filters
    upon loading a producer from XML.
  * Ensure filters added by the `loader` producer always come
    first in list.
  * Fixed a crash using `shape` and `affine` filters together on
    `color` producer.
  * Fixed a crash when a `vidstab` file fails to open.
  * Changed `vidstab` filter to save its file in ASCII text mode.
  * Fixed a clang LTO error in the `decklink` module.
  * Fixed a video decoding regression on some videos in the
    `avformat` producer.
  * Fixed a crash in the `audiowaveform` filter.
  * Fixed loading a relative filename from XML for `mask_start`
    with `shape`.
  * Fixed "#filedate#" in `dynamictext` filter when used with
    `timeremap` link.
  * Fixed `timer` filter's new `speed` property interaction with
    `start` delay.
  * Fixed a crash with YUYV422 (YUY2) input in `avformat`
    producer.
  * Fixed data race condition in `timeremap` link.
  * Fixed compiling `avformat` module with FFmpeg git beyond
    v4.4 with many deprecations removed.
  * Fixed alpha channel size calculation in `brightness` filter.
  * Restore legacy tracker and the new DaSiam tracker for OpenCV
    >= 4.5.3 in the `opencv_tracker` filter.
  * Fixed a crash in `opencv_tracker` on `shape_width` = 0.
  * Fixed incorrect handling of in and out points and duration
    in the `opencv_tracker` filter.
  * Fixed the `composite` transition leaking left border of an
    image on the right side on uneven width.
  * Fixed a problem handling some UTF-8 in thhe `typerwriter`
    filter.
  Other:
  * Added support for the `RELOCATABLE` CMake option for Linux
    or BSD build.

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