- Adds dynamic events which are updatable between graph executions
- Removes limitations on depending on SYCL events from outside a graph
- depends_on property can now take events/dynamic events
- Allow barriers in the explicit API
- Extend barriers to support dynamic events
- Added get_event() to get event for node execution in a graph
- Add a new graph property which requires that an execution event is available
- Add new examples to the usage guide for dynamic events and command_graph::get_event()

…aphs

- Remove restrictions on limited graph events being used in other graphs
- Now used to define inter-graph dependencies
- Various changes to errors etc. to reflect change
- Add example of this to usage guide

- Also includes basic API examples for both explicit and recording

- Rename limited graph events to graph-limited events
- Clarify language of external dependencies in graphs
- Remove usage of "internal edges"

- Clarify what they represent with example

- Inter-graph dependencies must have source graph finalized before creation
- Graphs with inter-graph dependencies can only be finalized once
- Update usage guide example on inter-graph dependencies
- Various updates to improve error coverage of method definitions.