Blender Git Loki

Cleanup: Unused variable in release build mode

Thanks Bastien for code review!

Fix for the Python console not setting the cursor

Fix API docs build after recent changes in BMesh operators.

Note: not sure what 'type' to give for that new
`BMO_OP_SLOT_SUBTYPE_PTR_STRUCT`, name sounds generic so used
`bpy_struct` for now... :/

BLI_task: Add pooled threaded index range iterator.

This code allows to push a set of different operations all based on
iterations over a range of indices, and then process them all at once
over multiple threads.

This commit also adds unit tests for both old un-pooled, and new pooled
`task_parallel_range` family of functions, as well as some basic
performances tests.

This is mainly interesting for relatively low amount of individual
tasks, as expected.

E.g. performance tests on a 32 threads machine, for a set of 10
different tasks, shows following improvements when using pooled version
instead of ten sequential calls to `BLI_task_parallel_range()`:

| Num Items | Sequential | Pooled | Speed-up |
| --------- | ---------- | ------- | -------- |
| 10K | 365 us | 138 us | 2.5 x |
| 100K | 877 us | 530 us | 1.66 x |
| 1000K | 5521 us | 4625 us | 1.25 x |

Differential Revision: https://developer.blender.org/D6189

Merge branch 'master' into tmp-task-foreach-pool

UI: Reduce width of UI-List scrollbars

When scrollbars were redesigned, the size of UI-List scrollbars wasn't
updated. Those were still huge.
This makes their size consistent with other scrollbars and frankly,
non-rediculous.

Merge branch 'master' into greasepencil-object

Cleanup: used BKE_mesh_ prefix

Missed in recent BKE_remesh renaming.

CMake: support building without Python

Resolve linking issues, warnings.

Cleanup: remove unused CMake WITH_MOD_CLOTH_ELTOPO option

Fix WITH_INPUT_IME breakage in last commit

UI: scale widget cursor by pixel size

Cleanup: doxygen comments

Also correct some outdated symbol references,
add missing 'name' commands.

use generic dot export to export function networks

LANPR: Remove LANPR_LineLayerComponent struct as it's no more used.

export inlined node tree as dot graph

Cleanup: spelling, repeated words

import dot export

LANPR: Fix chain point count error.

LANPR: CMake option in the RNA.