channel names
Working with multiple strips keyframes was unneccessarily difficult in
Animation Editors (since some anim channels could not be distinguished).
Namely `Crop` and `Transform` are nested structs (nested under
`Sequence`), so these were just displaying the raw struct name.
Also strip modifiers did not have their strip name in their channel
names. Now include the strip name for these.
before
{F10277439}
after
{F10277441}
Maniphest Tasks: T90595
Differential Revision: https://developer.blender.org/D12193
77744b581d