Goal of this PR is mainly to improve flexibility and of VSE layout and
screen space efficiency.
Previously, strip properties were displayed in timeline sidebar. This
was limiting, because if you want to display as much properties as
possible, the timeline area had to be taller, but this was at the
expense of space available for preview. However there is plenty of
space in properties editor, which is mostly unused in VSE. Therefore
strip properties were moved to the properties editor.
ID pinning and path displayed in top section aren't drawn, since strip
is not an ID and can not be pinned. Since there is more space for
properties, various panels are changed to be open by default.
Mainly transform and time panels, since they are used often.
There is one minor change: The waveform display property
of sound strip was previously hidden, if timeline area had per strip
waveform display overlay set. This is no longer possible to do and the
property is always visible.
Pull Request: https://projects.blender.org/blender/blender/pulls/140395
f385327442