Add spawn() and resume() to HostSession and implement partially in Darwin backend
Update the libgum dependency
Update Fruitjector to use the new Gum API and clean it up a bit
Advance the Darwin spawn() implementation closer to something working
Update the libgum dependency
Complete the Darwin spawn() and resume() implementation

Also add kill() for convenience.
Change Darwin kill implementation to be a bit more subtle
Add spawn() and resume() to pyfrida
Update the libgum dependency
Fix argv in Darwin spawn test
Merge branch 'feature/spawn-process'