Make deps: Enable fPIC for Linux

Similar to D8823.

Implement ID properties support for TimeMarker

Allows scripters to store additional information in the marker itself instead
of using work-around approach based on marker names and such.

Differential Revision: https://developer.blender.org/D8944

Cycles: Add time report for Blender data synchronization

Allows to more easily access time information about how long Cycles
did spend synchronizing objects from evaluated depsgraph on Blender
side to its own structures.

This timer does not include time spent evaluating render depsgraph.

Cleanup: Misplaced fullstop in comment

Make deps: Compile own nasm for Linux

This solves annoyance that the official RPM repository of nasm requires
newer version of rpm tool compared to what is shipped by default with
centOS 7.

Differential Revision: https://developer.blender.org/D8905

Codesign: Report codesign errors from server to worker

Pass codesign errors (if any) from codesign buildbot server to the
buildbot worker, so that the latter one can abort build process if
the error happens. This solves issues when non-properly-notarized
DMG package gets uploaded to the buildbot website.

This is an initial pass of implementation tested on Linux. Other
platforms requires to have proper testing.

Particles: Allow python to write hair keys

Add a function HairKey.co_object_set() which can be used to modify hair
keys positions in a way that hair strands respects the new coordinates,
without doing extra trickery with edit mode toggle. The naming comes
from existing HairKey.co_object().

The usage is a bit tricky:

- The function is to be called on the hair key from an original object.
- The arguments are to be passed from evaluated object.

Basically:

hair_key_orig.co_object_set(object_eval, modifier_eval, particle_eval)

This is required because coordinate space conversion needs to know
evaluated state of the hair system in order to access hair space
matrix. It is a deliberate choice to not pass dependency graph and not
to do lookup of evaluated ID on every call of co_object_set() to keep
performance on a manageable levels.

One requirement is that the hair strands are to be calculated once, by,
for example, toggling particle edit mode. Without this there will be no
`particles` to access hair keys from in the original object.

Such functionality is something what got lost during 2.80 development
and is something what is needed here at the studio.

Below is the file with more complete example: convert strands from mesh
edges to actual particle system hair strands. The viewport refresh is
sometimes missing, and this does not seem to be related to this specific
change.

{F8858104}

Differential Revision: https://developer.blender.org/D8849

Fix T77763: Wrong highlight of active grab vertex

The "Grab Active Vertex" in sculpt mode highlights the vertex and
the neighbor vertices. This was working wrong in the case when mesh
has multires modifier at sculpt level 0 and has shape keys.

The issue was caused by the wrong crazy space calculation, which was
ignoring subdivision level. This is an oversight from the initial
implementation: the modifier has no effect if the subdivision level
is 0.

Multires: Fix memory leak when multires is at level 0

There is no SubdivCCG created in this case, meaning ownership of the Subdiv
was not altered.

Cycles: Cleanup, mark overridden virtual methods as such

Solves strict Clang warnings reported on Linux.