This update is needed by future bits of KDE Applications (kdenlive in particular)

- Update to version 6.18.0
Framework:
* Fixed some data races in mlt_consumer, mlt_deque, and
mlt_property.
* Fixed the mlt_events listener incorrect owner argument.
* Added support for the LC_ALL environmant variable on Windows.
* Fixed the argument to mlt_factory_init() not working on
Windows.
* Fixed mlt_service_identify() not reliable in some use cases.
* Added some default and copy constructors and assignment
operators to mlt++
+ Filter()
+ Filter( const Filter &filter )
+ Filter& operator=( const Filter &filter )
+ Producer( const Producer &producer )
+ Producer& operator=( const Producer &producer )
+ Properties( const Properties &properties )
+ Properties& operator=( const Properties &properties )
+ Service( const Service &service )
+ Service& operator=( const Service &service )
+ Transition()
+ Transition( const Transition &transition )
+ Transition& operator=( const Transition &transition )
* Added mlt_luma_map:
+ mlt_luma_map_init
+ mlt_luma_map_new
+ mlt_luma_map_render
+ mlt_luma_map_from_pgm
+ mlt_luma_map_from_yuv422
* Fixed preset overrides depend on the XML attribute order.