Fix T89213: Some modifier properties have wrong subtype

This commit resolves these RNA warnings:
```
offset: "", WARN (bpy.rna): ...sourceblenderpythoninternbpy_rna.c:1505 pyrna_enum_to_py: current value '65536' matches no enum in 'FloatProperty', 'offset', 'subtype'
project_limit: "", WARN (bpy.rna): ...sourceblenderpythoninternbpy_rna.c:1505 pyrna_enum_to_py: current value '65536' matches no enum in 'FloatProperty', 'project_limit', 'subtype'
falloff_radius: "", WARN (bpy.rna): ...sourceblenderpythoninternbpy_rna.c:1505 pyrna_enum_to_py: current value '65567' matches no enum in 'FloatProperty', 'falloff_radius', 'subtype'
```

Fix 'BLI_task_parallel_mempool' keeping 'user_chunk' unchanged

When `BLI_task_parallel_mempool` does not use threading, the
`userdata_chunk` is allocated locally simulating a TLS.

However `func_reduce` is not called so the original chunk is ignored.

`task_parallel_iterator_no_threads` is another function that doesn't call
`func_reduce`. It also ignores `userdata_chunk_local` in the main iterator.

The solution in these cases is not to create a `userdata_chunk_local`.

This fixes T90131

Differential Revision: https://developer.blender.org/D12067

Cleanup: Rearrange mesh extraction files

In the draw module, it's not easy to identify what its header is, and
where the shared functions are.

So move `draw_cache_extract_mesh_extractors.c` and
`draw_cache_extract_mesh_private.h` to the same folder as the extractors
and rename these files to make them more identifiable.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D11991

Revert "VSE UX: Make Speed Effect strips more user friendly."

This reverts commit 3123f33380b35ae93afee0a30f36bc7181927b28 and
a092baa7f90b2d5f13771d46f64ff5cf86cc5a05.

VSE UX: Make Speed Effect strips more user friendly.

**Drawing Changes:**
- F-curve drawing for Stretch, Multiply, Length and Frame Number.
- Value drawing when no keyframes for Stretch, Length and Frame Numbers.

General view of the new drawing for each speed effect mode:
{F9796642, size=full}

Detail of the horizontal zero (blue) line in the new `Multiply` mode:
{F9798520, size=full}

Nice to have (but I don't know how):
- Auto adjusting of endframe when using Multiply or Boost.

Differential Revision: https://developer.blender.org/D6110

Many tweaks to f-curve drawing code

VSE: Speed Effect layout updates

**Changes:**
- New enums correspond to 4 modes: `Stretch`, `Multiply`, `Frame Number` and `Length`.
- "`Multiply Factor`" has been removed;
- Value corresponding to "`use as speed`" enabled is now the value appended to the `Multiply` enum;
- Value corresponding to "`use as speed`" disabled is now the value appended to the `Frame Number` enum;
- Value corresponding to "`Scale to Length`" enabled is now the value appended to the `Length` enum;
- Except `Stretch` each mode has now its respective control values.

Differential Revision: https://developer.blender.org/D11856

Fix name used when parsing arguments

PyGPU: new method 'GPUFrameBuffer.read_depth'

Method requested by users in order to port addons to new API.

Cleanup: Silence warning - unused parameter