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We should take deltaTrackId and deltaPos explicitly because they affect the result of sorting.

Sorry for those mistakes...

Simply because it doesn't have to be defined in every Track instances and it's a big function.

This fixes strange/invalid units being used and causing the
thumbnails display to behave badly
Signed-off-by: Yikai Lu <luyikei.qmltu@gmail.com>

Because it is only used once and even there it should be replaced by only one simple line

As we want to use it in onPositionChanged also

- Add missing headers
- Let the framework handle background generation of the thumbnails
- Let the framework handle the caching
- Use Image instead of Pixmap, since the later might not be usable
outside of UI thread

This removed the formats from clip, in favor of a "isAudio" boolean
flag

Instead we now have a small structure containing an "instance" of a
clip, in the workflow
This instance ID needs to be used when manipulating clips from the
timeline