Merging of our refactoring code

[Jean-Baptiste Mardelle]

Hi all,

No news for a long time since we were very busy working on our big rewrite. 
After many delays, we finally think it's time to merge!

This means that in the next days, all these major changes will land in 
Kdenlive's git master, and is scheduled for the KDE Applications 19.04 
release.

Since we now rely on qml for the timeline, a few extra dependencies have 
been added, and QtMultimedia will also probably be added as a requirement 
to enable audio recording.

For packagers or those compiling themselves, our development info page 
should give you all informations to successfully build the new version:

https://community.kde.org/Kdenlive/Development#Installing_dependencies

We hope everything goes smoothly and will be having a sprint near Lyon in 
France next week to fix the remaining issues.

We all hope you will enjoy this new version, more details will appear in 
the next weeks.

Regards
Jean-Baptiste Mardelle