Ai2thor

* Add new `platform` Controller constructor parameter
* Allow users to manually run CloudRendering platform

* Bug fixes and stability improvements to Manipulathor Arm 820

* Adds `controlledObjects` to object metadata for sim objects that directly control others (eg: objects like StoveKnob now reports which StoveBurner they control in metadata)

* Update to how filled objects update as per issue 844

* Backend update of Agent Controller to streamline components and initialization logic

* Fixes to VideoController to account for changes in backend Agent Controller updates. PR 856

* Updates SetObjectPoses to respect placeStationary parameter correctly

* Fix toward high level held object logic not property resetting agent hand position

* Updates default visibility of red `placeable surface` surfaces to off in editor.

* Various optimizations and bug fixes to backend logic

* https://github.com/allenai/ai2thor/pull/821 includes bug fixes for `InitialRandomSpawn` where objects would occasionally break or disappear from the scene.
* https://github.com/allenai/ai2thor/pull/824 and https://github.com/allenai/ai2thor/pull/832 make breaking changes to the temperature decay API.
* https://github.com/allenai/ai2thor/pull/823 provides the ability to set a global random seed.
* https://github.com/allenai/ai2thor/pull/829 allows `--height` and `--width` to be passed into `ai2thor-xorg start`.
* https://github.com/allenai/ai2thor/pull/835 updates `cameraOrthSize` in the metadata when the (deprecated) action `ToggleMapView` is called.
* https://github.com/allenai/ai2thor/pull/816 provides internal updates to `AddThirdPartyCamera`

* https://github.com/allenai/ai2thor/pull/814 adds official support for a top-down camera (deprecating the private `ToggleMapView`). To use it, run:
python
from ai2thor.controller import Controller
event = controller.step(action="GetMapViewCameraProperties")
controller.step(
action="AddThirdPartyCamera",
**event.metadata["actionReturn"]
)

* https://github.com/allenai/ai2thor/pull/801, https://github.com/allenai/ai2thor/pull/803, and https://github.com/allenai/ai2thor/pull/805 improve the usability of ManipulaTHOR.
* https://github.com/allenai/ai2thor/pull/808 fixes a logging bug on the Python side.

* PR 770 - Rename RotateHand, MoveHand*, and RotateHandRelative
* Add fix for rate limit error caused when passing in `branch` to the Controller

* https://github.com/allenai/ai2thor/pull/796 removes rogue trigger collider for toilet paper in FloorPlan424. Solves #794.
* https://github.com/allenai/ai2thor/pull/795 adds some visibility points to counter tops such that they are visible from more positions. (Solves issue mentioned internally by sagadre.)
* https://github.com/allenai/ai2thor/pull/786 doesn't redo all the object ID calculations once an object is removed from the scene. Partially solves https://github.com/allenai/ai2thor/issues/773.
* https://github.com/allenai/ai2thor/pull/780 now supports the `RandomizeMaterials` action with image synthesis on (e.g., rendering instance segmentation or depth frames).