Move some v8 objects from CJS back into FXJS

Create a new class to hold these, CFXJS_Engine (could have been
called Runtime, but there are too many "Runtimes" already). In a
subsequent patch, all the FXJS_*() functions that take an isolate
as the first argument can become methods on the engine.

CJS_ must still manage the isolates; this happens outside
the engine.

The IJS_Runtime abstraction moves up to fpdfsdk/javascript; it
remains to allow for either a real JS library or a stubb one to
be linked (for non-js builds).

Review-Url: https://codereview.chromium.org/2241483004

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