Blender Git Loki

WM: Add 'Confirm On Release' option for WM_OT_radial_control

Adds a new property called "Confirm On Release" that does what it says,
confirm the action without having to do left-click or to press any other
extra-key which concludes in a more dynamic and efficient way of changing
brush size or strength for example, especially for tablet users.

Reviewed By: campbellbarton

Ref D10233

Cleanup: use the assignment operator with list-comprehension

Cleanup: don't subclass 'Panel' for mix-in classes

This reports warnings with `--debug-python` since all panel
sub-classes are expected to be registered.

Cleanup: remove unused panel SEQUENCER_PT_sound

These have since been moved to SEQUENCER_PT_source.

Docs: add notes to 'make deps' & the sqlite build configuration

- Move non-blender build targets into their own section.
- Expand 'make help' text, noting a local 'make deps' overrides.
- Note where the spell checkers word-list is maintained.
- Note on why sqlite is built without 'tcl'.

Cleanup more unused variables and functions

Remove debugging print statements

Merge branch 'master' into temp-gpencil-bezier-v2

Fix memory issues and crashes.

Cleanup various lineart files, add FIXME comments.

USD import: xform cache constraint parenting bug.

USD_get_transform() was not taking the object's parent
transform into account. Now following the same logic
as in the corresponding Alembic implementation,
ABC_get_transform(), to fix this.

CMake: update MSVC PDB path reference

Replace literal number with a variable.

PyAPI: Use PyPreConfig & PyConfig for Python initialization

Use Python 3.8's API for setting the initial configuration.

This replaces a mix of our logic and direct calls to the Python API
and has no user visible changes.

Using the Python API makes the logic easier to follow and provides
utilities such as `PyConfig_SetBytesArgv`
that wasn't available in previous releases.

Note that this uses Python's utf8/wchar_t conversions,
which used to cause problems (see T31506).

Since `Py_UTF8Mode` was set, the systems locale isn't used for decoding,
allowing us to use Python's utility functions that call
`Py_DecodeLocale` internally.

Ref D10382

PyAPI: use PyModule_AddType utility function

PyAPI: remove Python 3.7x compatibility code

This removes Python version checks needed to build with 3.8+ and 3.7x.

Ref D10381

CMake: update python to 3.9.1

Default to Python version 3.9.

Reviewed By: LazyDodo, sybren, sebbas

Ref D10380

Cleanup: clang-format, spelling

Mesh automated testing: compare selection

MeshTest now compares selection between evaluated mesh and expected mesh. This way, we can test more operators
such as `faces_select_linked_flat`

Note: selection comparison intentionally does not happen in BKE_mesh_cmp() on C side but rather on Python side, because
selection is independent of mesh generation.

Reviewed By: calra, mont29

Differential Revision: https://developer.blender.org/D10279

Sculpt Expand: Fix and improve behaviour of pivot reposition

Fix finding system Haru library on Debian.

Paths and names of system packages-installed libhpdf on Debian (and
probably its derived distributions?) are slightly different than what
was given to CMake finding script.