Fix T69816: Using Transform gizmos in Sculpt Mode while MultiRes is activated crashes Blender

Reviewed By: jbakker

Maniphest Tasks: T69816

Differential Revision: https://developer.blender.org/D5779

Fix T69804: Transform tools in sculpt mode fails with transformed objects

Reviewed By: mano-wii

Maniphest Tasks: T69804

Differential Revision: https://developer.blender.org/D5777

Fix T69737: Crash using the Elastic Deform brush and Compressibility

Also renamed "compressibility" to "volume preservation"

Reviewed By: brecht

Maniphest Tasks: T69737

Differential Revision: https://developer.blender.org/D5757

Sculpt: Topology automasking

The sculpt automasking feature assigns a factor to each vertex before starting the stroke. This can be used for isolating disconnected meshes, masking cavities, mesh boundary edges or creating topological falloffs.

This commit implements automasking in all brushes and topology automasking without topology falloff.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5645

Sculpt: Pose Brush

This brush lets the user pose a model simulating an armature-like deformation. The pivot point for rotation is calculated automatically based on the radius of the brush and the topology of the model.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5647

Sculpt: Elastic Deform Brush

This patch implements the paper "Regularized Kelvinlets: Sculpting Brushes based on Fundamental Solutions of Elasticity" https://graphics.pixar.com/library/Kelvinlets/paper.pdf

It includes grab, biscale grab, triscale grab, scale and twist.
All deformation modes are accessible under the same tool. This helps to keep the code organized and it should not make any difference to the user when a better brush management system is implemented.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5634

Sculpt: Mesh Filter Tool

The mesh filter tool applies a deformation to all vertices in the mesh at the same time. It includes multiple deformation modes and the option to lock the deformation axis.
This commit also includes the FilterCache, which is needed in some new operators and tools.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5513

Sculpt: Mask Filter and Dirty Mask generator

The mask filter operator modifies the whole paint mask. In includes multiple operations like smooth, grow or contrast accessible from a pie menu.
The dirty mask generator is similar to Dirty Vertex Colors, but it generates a paint mask. It can be used to mask cavities in the sculpt.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5496

Sculpt: Draw Sharp Brush

This brush is similar to the draw brush but it deforms the mesh from the original coordinates. When used with the sharper curve presets it has a much more pleasant crease/cut behavior than any of the other brushes. This is useful for creating cloth wrinkles, stylized hair or hard surface edges.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5530

Fix T69548: Sculpt scene spacing breaks when object pivot not at origin

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5699