Previously, the LibWeb bindings generator would output multiple per
interface files like Prototype/Constructor/Namespace/GlobalMixin
depending on the contents of that IDL file.
This complicates the build system as it means that it does not know
what files will be generated without knowledge of the contents of that
IDL file.
Instead, for each IDL file only generate a single Bindings/<IDLFile>.h
and Bindings/<IDLFile>.cpp.
This is largely editorial. One behaviour change is that events are now
sent from a global task on the DOMManipulation task source.
Somewhat awkwardly, the spec refers to `this` before the Worker exists.
As it's for getting the relevant global object / settings object, I've
had to work around that.
Corresponds to:
917c2f6a73
Shared workers are essentially just workers that may be accessed from
scripts within the same origin. There are plenty of FIXMEs here (mostly
building on existing worker FIXMEs that are already in place), but this
lets us run the shared worker variants of WPT tests.
