Since effect strips can't be transformed directly, their selection had
to be forced in order to process them. This often failed in more
complicated scenarios, because there was no attempt to parse hierarchy
completely. In worst case only one effect in chain would be selected.
This code was marked by `XXX_DURIAN_ANIM_TX_HACK`.
Instead solution described above, a collection of strips that depend
on non effect strip position is built by function
`query_time_dependent_strips_strips` and it is stored in `TransSeq`.
In `flushTransSeq` this collection is iterated and transformation offset
is applied to effect strip animation. Strips in collection should be
consistent with true state of dependency and should be complete.
Functional changes:
- When 2-input effect strip changes position, animation is offset even
if only handles are moved. This only applies to 2-input effect however.
- Selection is not extended to include effect strips anymore. If effects
are to be moved, they must be selected manually. This is because
previously it was very hard to reorganize effects in chain, since moving
first strip in chain would always select anywhere from 1 to n effects.
So creating or filling gap in channel would almos always result in
collision especially if their order in timeline doesn't perfectly
represent their order in chain.
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