Fix T84964: Crash when running Knife Project in the background

Although the Knife Project operator converts 3D coordinates to screen
space, it doesn't really need opengl.

Differential Revision: https://developer.blender.org/D10178

Cleanup: Knife Tool: Remove redundant 'view3d_operator_needs_opengl' calls

This function sets the `RegionView3D` matrices to the GPU.
But the OpenGL library is not actually being used by the operator.

Fix T81429: move tool's axis constraints not drawn completely when using local orientation

In fact, the drawing was that of the local contraint axis (which is
summarized so as not to fill the screen with too much information).

Use the local contraint axis only when more than one object is selected.

Revert "Transform: Use orientation of active object with Auto Constraint"

This reverts commit 54f248fa87afd4836fb7154056cd0e8d920401f1.

And fixes T84259.

Apparently the ideal behavior was the previous one.

Fix T84808: Individual projection works even when snap options don't affect the transform mode

Individual projection is a different branch of snap and always projects
the transformed elements on the surface of objects.

Perhaps this option should be limited to the Move mode due to similarity.

But in order not to change the current behavior too much, this commit only
disables this option in modes not affected by snap.

Merge branch 'blender-v2.92-release'

Fix T84673: Skin resize operator always using object origin as pivot

The TransData converted to work in Skin Resize had no defined center.

Caused by rB54ee4109143b

Fix Increment Snapping Without Constraints in Non-Axis-Aligned Views

The incremental snap was always operating in the local space, which in most
cases is the VIEW type orientation.

Use only local space when the operation is affected by constraint.

Differential Revision: https://developer.blender.org/D10052

Fix T84453: Crash bezier curves transfrom

The pointer allocated to the `TransData` was being incorrectly incremented,
causing misalignment and consequently `heap-buffer-overflow`.

Because of this, `TD_NOTCONNECTED` was being set in a strange way that did
not correspond to other types of `TransData`.

The solution is to not increment the `TransData` pointer and set
`TD_NOTCONNECTED` only for "unconnected" segments.

The code was also a bit deduplicated.

Fix T83460: Regression in snap for measure tool

Now the gizmo is drawn only when the eventstate located in
`wm->winactive->eventstate` has not changed.

So it doesn't matter if it's "selected" or not.

This commit also removes the use of the private header "wm.h"

Reviewed By: campbellbarton

Differential Revision: https://developer.blender.org/D9539