This code generator no longer creates JS wrappers for platform objects
in the old sense, instead they're JS objects internally themselves.
Most of what we generate now are prototypes - which can be seen as
bindings for the internal C++ methods implementing getters, setters, and
methods - as well as object constructors, i.e. bindings for the internal
create_with_global_object() method.
Also tweak the naming of various CMake glue code existing around this.
This is a monster patch that turns all EventTargets into GC-allocated
PlatformObjects. Their C++ wrapper classes are removed, and the LibJS
garbage collector is now responsible for their lifetimes.
There's a fair amount of hacks and band-aids in this patch, and we'll
have a lot of cleanup to do after this.
- Delete the part about removing `[Exposed=Window]` since that's not
necessary and we may want that information there to generate the
Window object.
- Mention adding `#import`s.
- Outline the requirements for the implementation class.
- Mention the non-Event wrapper factories that need to know about
certain types.
I tend to refer to this document every time I add an IDL type so it's
helpful if it's comprehensive.
