Voxel Remesh: Edit Voxel Size operator

This operator lets the user control the voxel/detail size of the voxel remesher directly from the 3D view in a similar way the Brush radius and strength are controlled.  The shorcut from sculpt mode is Shift + R (similar to Shift + F for brush strength).
It shows a grid that represents the real voxel size of the object. The grid and the text are automatically aligned to the view to avoid rendering all voxels with thousands of lines.

It also has a slow mode when pressing shift that works like the slow mode of the brush radius control.

This operator controls the value changes sensitivity automatically to avoid jumping to extremelly high resolutions and run out of memory.
This way, adjusments done in lower voxel sizes are more precise. Pressing Ctrl disables this functionality and allows changing the voxel size directly in a linear way.

Reviewed By: jbakker, #user_interface, billreynish

Differential Revision: https://developer.blender.org/D6449

release/scripts/presets/keyconfig/keymap_data/blender_default.py

@@ -4323,6 +4323,7 @@ def km_sculpt(params):
         ("sculpt.set_detail_size", {"type": 'D', "value": 'PRESS', "shift": True}, None),
         # Remesh
         ("object.voxel_remesh", {"type": 'R', "value": 'PRESS', "ctrl": True}, None),
+        ("object.voxel_size_edit", {"type": 'R', "value": 'PRESS', "shift": True}, None),
         ("object.quadriflow_remesh", {"type": 'R', "value": 'PRESS', "ctrl": True, "alt": True}, None),
         # Brush properties
         ("brush.scale_size", {"type": 'LEFT_BRACKET', "value": 'PRESS'},