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CMCL-690: 2.8.4 backports (#367)

* CMCL-667: Show calculated confiner for not live vcams. (#365)

* Don't check for isLive

* minor doc

* CMCL-661: remove illegal destructor (#364)

* remove illegal destructor

* Update VcamStageEditor.cs

* fix exception on undo

* CMCL-686: targets forget that they are groups (#366)

* add domain reload callback to invalidate target cache

* release notes

* Fix 2019.4 compile error

* Update CHANGELOG.md

* CMCL-648: backport (#372)

* Input is realtime - backport

* Removed collections include

* CMCL-706: Fix for InputProvider causes tiny GC alloc every frame (#369)

* bumped package version to 2.8.4

* CMCL-710: 3rd person gimbal lock fix (#370)

* eliminate 3rdpersonFollow console spam when looking up or down

* revert a too-aggressive change

* too aggressive again

* Update CHANGELOG.md

* Fixed missing changelog entry.

* Removed mention of handles from changelog

* Added missing changelog for CMCL-666.

Co-authored-by: Krisztian G. Birkas <57672095+gaborkb@users.noreply.github.com>
Co-authored-by: Gregory Labute <gregoryl@unity3d.com>

CMCL-690: 2.8.4 backports (#367)

* CMCL-667: Show calculated confiner for not live vcams. (#365)

* Don't check for isLive

* minor doc

* CMCL-661: remove illegal destructor (#364)

* remove illegal destructor

* Update VcamStageEditor.cs

* fix exception on undo

* CMCL-686: targets forget that they are groups (#366)

* add domain reload callback to invalidate target cache

* release notes

* Fix 2019.4 compile error

* Update CHANGELOG.md

* CMCL-648: backport (#372)

* Input is realtime - backport

* Removed collections include

* CMCL-706: Fix for InputProvider causes tiny GC alloc every frame (#369)

* bumped package version to 2.8.4

* CMCL-710: 3rd person gimbal lock fix (#370)

* eliminate 3rdpersonFollow console spam when looking up or down

* revert a too-aggressive change

* too aggressive again

* Update CHANGELOG.md

* Fixed missing changelog entry.

* Removed mention of handles from changelog

* Added missing changelog for CMCL-666.

Co-authored-by: Krisztian G. Birkas <57672095+gaborkb@users.noreply.github.com>
Co-authored-by: Gregory Labute <gregoryl@unity3d.com>

added metafile for ValidationExceptions.json.meta