Per-Viewport Collection Visibility

Support per-viewport collection visibility options.

Note 1: There is no way to show a collection that was not visible before
due to depsgraph. Otherwise we would risk having all the collections in
the depsgraph and I believe this is not the idea.

An alternative would be to have a new depsgraph for viewports that are
not local. Something to keep in mind if we do per-viewport current frame
in the future.

So for now what we do is to only allow collections visibility to be
disabled/hidden in this mode.

Note 2: hide_viewport (the eye icon) doesn't really matter for
depsgraph. So after the merge we can still ignore it to show the
collections locally in a viewport with no problems for the depsgraph.

Reviewers: brecht, sergey
Subscribers: billreynish

Related task: T61327
Differential Revision: https://developer.blender.org/D5611

Multi-View user interface minor tweak

There is no reason to not expand this enum as we did for 2.79.
It is self explanatory enough and it has only two options.

Fix T68705: Changing any editor to the properties crashes Blender

Issue introduced (more like exposed) in b7f86ff72273.

Fix T68705: Changing any editor to the properties crashes Blender

Issue introduced (more like exposed) in b7f86ff72273.

Fix T68658: Text offset makes scale to fit not to work

Differential Revision: https://developer.blender.org/D5484

Fix T66948: Outliner - collections/objects with wrong active state

If the parent collection was out of view we were not taking its
properties into consideration. We need it even when not drawing the
parent to set active/inactive values for its children.

Related Task: T66948

Reviewers: brecht

Subscribers: Zachman

Differential Revision: https://developer.blender.org/D5272

Fix T64312: Selection inconsistencies when switching collections

Basically layer_collection_sync was calling BKE_base_eval_flags right away while
iterating over the bases.

However when a parent/sibling collection is to influence the collection flag of
an object that exists in more than one collection, it is too late since we
deselect the object in BKE_base_eval_flags right away.

Related to T64312.

Reviewers: sergey, brecht

Differential Revision: https://developer.blender.org/D5243

Edge Slide: Fix multi-object for loop early exit

Part of D5274, reviewed by Campbell Barton.

Fix T67078: Crash with vertex slide and multi-objects

If one of the objects had invalid selected edges, it would lead to a
crash since none of the for loops were checking for whether the edge
slide data is valid.

We could refactor the macros to create a new
FOREACH_TRANS_DATA_CONTAINER_WITH_DATA

However we are too close to 2.80 final release so we manually skip them
for now.

Note: TRANS_DATA_CONTAINER_FIRST_OK cannot be used either for the same
reason.

Reviewers: campbellbarton

Differential Revision: https://developer.blender.org/D5274

Fix T66530: set_stereo_3d (pageflip) exists Blender

Note: Although this fixes the issue (as in, it prevents a crash)
BKE_reports are not working because of CTX_wm_window_set().

Reviewers: campbellbarton

Differential Revision: https://developer.blender.org/D5210