Ai2thor

- Introducing [ManipulaTHOR](https://ai2thor.allenai.org/manipulathor/), an environment within the AI2-THOR framework that facilitates visual manipulation of objects using a robotic arm.
- Adding new `RandomizeLighting` action
- Adding new `ScreenSpace Raycast Query` action
- Various updated actions and metadata

Please see the [full 3.0 release notes here](doc/static/ReleaseNotes/ReleaseNotes_3.0.md)

* 623 Add GetObjectInFrame action
* 613 Teleport and TeleportFull bug fixes and enhancements

* Add new action MakeAllObjectsStationary
* Add better error handling for SetObjectPoses
* 'Moveable' objects can now also be repositions with SetObjectPoses
* Added 'placeStationary' flag to SetObjectPoses
* Update laptop prefab to reference correct bounding box
* Adding RestartError to allow for recovery of crashed Unity process
* renaming rendeClassImage -> renderSemanticSegmentation, renderObjectImage -> renderInstanceSegmentation
* modify movement checks that determine if agent is blocked
* fixes for TeleportFull
* Upgrade Unity to 2019.4.20
* Add MoveGlobal function

* locobot renaming
* renderSegmentation renaming
* Pin Unity binary version to 2.7.0

* Default FastActionEmit to True

* Bug fixes to ToggleObject.