console.lua: implement a command parser to complete more thingsHEADmaster

This allows more completions than patterns:

Both single and double quotes are recognized.
Quotes around the first token are recognized.
Command prefixes are recognized.
Choice options are completed after change-list/vf/af add/append/pre/set.
File paths are completed after set/cycle-values/change-list with options
that expect files, including cycling between paths with spaces, e.g.
cycle-values glsl-shaders 'foo bar' 'baz qux'.
File paths are completed in the fourth argument of dump-cache.
Items that have been set are completed after change-list remove.

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