BREAKING CHANGE:
Removed several deprecated APIs:
- EngineHost `listSchematics` has been removed in favour of `listSchematicNames`.
- `FileSystemSink` - Use the new virtualFs.Host classes from `@angular-devkit/core`.
- `optimize` function has been remove as trees are automaticlly optimized.
- `DryRunSink` deprecated constructor that allowed to provide a directory path has been removed. Provide a `virtualFs.Host` instead.
Schematics context now have an (optional) analytics field that, if set,
should be used to report usage. This can be set even in some cases where
analytics is disabled (to a noop analytics).
Currently, all third-party schematic developers are forced to use and directly depend on `rxjs` if any logic is asynchronous. Doing so can can also add overhead and unneeded complexity for organizations that have chosen to standardize on async/await usage. This change allows such parties to rely on native promise support if desired.
And receives in its constructor the enginehost and registry. This simplifies the creation
of the NodeWorkflow, or later on the Google3Workflow etc, since all the duplicate logic
is now in a single base class.
This is yak shaving for internal stuff.
