* Add cameraPictureMetering and cameraPictureSnapshotMetering
* Adapt Meter and metering package to picture use
* Simplify Full2PictureRecorder, we'll use metering package instead
* Add doMetering parameter
* Implement cameraPictureMetering and cameraPictureSnapshotMetering in engine
* Add options in demo app
* Add better logs
* Add Snapshot2PictureRecorder
* Capture the correct frame based on timestamp
* Lock AE and AWB. Account for captureBuilder changes
* Fix runtime flash changes bug
* Small changes
* Flash support for metered snapshots
* Remove AE and AWB locks
* Lock AE/AWB/AF inside the snapshot recorder
* Small changes
* Fix AutoExposure metering
* Create Locker and locking.* parameters
* Implement Locker in Camera2Engine
* Implement reset delay in Camera2Engine instead of Meter
* Simplify Snapshot2PictureRecorder
* Fix success value
* Unlock inside Camera2Engine
* Do not lock for normal gestures
* Simplify logic
* Improve locking/AutoFocus
* Fix TORCH bug
* Small changes to locking and metering
* Remove AF and AWB for testing
* Create action package
* Create OneShotAction
* Create LogAction
* Revisit Full2VideoRecorder using actions
* Revisit Full2PictureRecorder using actions
* Enable missing functionality in Snapshot2PictureRecorder
* Move Snapshot2PictureRecorder using actions, rewrite lock package
* Add TimeoutAction
* Add comments to the action package
* Add meter package
* Remove old metering package
* Fix various bugs
* Add action.abort()
* Abort old MeterAction when running new ones
* Fix various bugs
* Add doc empty page
* Add documentation
* Fix tests
* New getSurfaceSize internal method
* Rename setPreviewSize and all internals to setPreviewStreamSize
* Rename getSurfaceSize to getPreviewSurfaceSize
* New snapshotMaxWidth and snapshotMaxHeight APIs
* Add docs
* Improve rescaling logic
* Add tests
Mattia Iavarone