trim: Add framework for performing dependency analysis while trimming

The current analysis is as brain-dead as possible. All calls are
interpreted as affecting the current "state" resource, and all calls
are also interpreted as depending on the current "state". In other
words, no calls at all will be trimmed. Obviously, this is not useful
analysis, but all the framewok is now present for easily doing more
interesting things.

A new --no-deps option is now made available to "apitrace trim" so
that users can avoid all dependency analysis and still get the prior
behavior where only calls explicitly included in the --calls option
are included in the trim output.