Geckordp

- add HeapSnapshotActor
- add MemoryActor
- add support for bulk responses

- add NodeActor
- add NodeListActor
- add AccessibilityActor
- add AccessibleWalkerActor
- add AccessibleActor
- add ParentAccessibilityActor
- add SimulatorActor
- add PerformanceActor
- add missing tests for WalkerActor
- refactor README Development section and dev/ directory
- add profile manager CLI tool to dev/profile.py

- cleanup package
- refactor profile and fix permission and access errors on specific edge cases
- run tests on Firefox 90.0 successfully

- refactor webconsole preferences functions, docs and tests
- added events registration for jmespath expressions
- test profiles are removed afterwards

- fix Firefox.start()
- firefox paths for macos corrected

- refactored documents