Blender Git Loki

3D View: remove non tool-system ruler

There was duplicate code for the ruler being accessed
as a tool and an operator.

Remove the modal operator code in favor of tool access.

Fix T58556: Some remaining 'dupli_types' in pycode after renaming.

Fix T58594: Modal circle select can't select & de-select

Merge branch 'master' into blender2.8

Fix T58535 Crash on Load

The particles was not ready when the drawing cache try to use it.

Fix T54580: Pointer buttons skip undo push

Merge branch 'master' into blender2.8

Use scene active object for sculptmode enter/exit calls

Match logic in previous commit.

Fix T56331: Undo crash w/ sculpt on hidden layer

Fix T56642: 3D view gizmo orientation wont update

Cleanup: warning, style

Fix T58528: Assign material skips non-active

Fix/workaround T58368: Crash w/ mapped mesh + autosmooth

Cleanup: remove flag from GizmoCommonData

Use struct member instead,
there are already many gizmo flags to keep track of.

Fix T58573: Camera lens gizmo error on click

Fix camera lens gizmo sensor comparison

Fix T58566: Blender 2.7x keymap not correct for select all toggle and spacebar.

Fix T56996: MacOS: Lagging when rotating the view

It happens on multiple configuration so we cannot isolate the fix to only
some config.

Thanks Hugo Lamarche for helping finding the fix.

backport of master fix for https://developer.blender.org/T56969

allows to let the branch run with python 3.7 too

transform fix for external centroid-based constraints