Fix T88263: Incorrect image offset from old file

Versioning code for converting strip offset property doesn't work, when
property was animated and disabled or when crop was used.

When offset property is animated and offset is enabled, animation is
converted to be used with new transform design. When offset is disabled,
animation is left untouched. New transform design doesn't have option
to disable offset, and therefore old unconverted animation is used
instead of converted static value.

Remove animation from propery if it was unused.

Another issue was that both X and Y offset animation was being corrected
by factor caluclated for X channel.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D11370

VSE: Improve animation evaluation performance

Use lookup string callback function for `sequences_all` RNA property
`rna_SequenceEditor_sequences_all_lookup_string` using a GHash for faster lookups.

When names are changed or strips are added/removed the lookup is tagged invalid.
The next time the lookup is used it will rebuild it.

Reviewed By: sergey, jbakker

Differential Revision: https://developer.blender.org/D11544

VSE: Remove seq->tmp usage from transform code

This field was used for extend feature to get handle position of
metastrip children. Since D9972 extend feature works only on meta
strip itself, not it's children.
So `SEQ_transform_get_left_handle_frame()` second argument is always
false and can be removed.

Another instance of `seq->tmp usage` is hack to distinguish strips to be
shuffled, which is not covered by this patch.

Reviewed By: campbellbarton

Differential Revision: https://developer.blender.org/D10321

FFmpeg: Fix H264 lossless render not lossless

While encoder parameters for lossless encoding are set correctly,
output is not lossless due to pixel format being set to
`AV_PIX_FMT_YUV420P` which is inherently lossy due to chroma subsampling.

This was reported in T61569 and was merged to T57397, but there were
2 bugs - one for encoding and one for decoding.

Set pixel format to `AV_PIX_FMT_YUV444P` when rendering lossless H264
files. This format isn't available in `codec->pix_fmts[0]` and it looks,
that it has to be hard-coded.

Reviewed By: sergey

Differential Revision: D11458

FFmpeg: Update proxy settings

Changes in rBce649c73446e, affected established proxy codec preset.
Presets were not working and all presets were similar to `veryfast`.
Tunes are now working too, so `fastdecode` tune can be used. I have
measured little improvement, but I tested this only on 2 machines and
I have been informed that `fastdecode` tune does influence decoding
performance for some users.

Change preset from `slow` to `veryfast` and add tune `fastdecode`

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D11454

Fix T57397: Movies are blurred after sws_scale

Images with 4:2:2 and 4:4:4 chroma subsampling were blurred when
`SWS_FAST_BILINEAR` interpolation is set for `anim->img_convert_ctx`.

Use `SWS_BILINEAR` interpolation for all movies, as performance is
not impacted by this change.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D11457

Cleanup: Strip duplication code

Remove unused flag `SEQ_DUPE_ANIM` and code used by this flag.
Remove flag `SEQ_DUPE_CONTEXT` and refactor code, to split operator
logic from duplication code.
Reduce indentation level in for loop.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D11318

VSE: Add strip-time intersection test function

Use SEQ_time_strip_intersects_frame function to test if strip intersects with frame.

Note: There are cases where this function should not be used. For example splitting
strips require at least 1 frame "inside" strip. Another example is drawing, where
playhead technically doesn't intersect strip, but it is rendered, because current
frame has "duration" or "thickness" of 1 frame.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D11320

Cleanup: Fix build warnings

VSE: Remove JPEG reference from proxy panel

Proxies doesn't use MJPEG codec anymore, but text still referenced it.