Consider Adding Scope Option Setter or Option Flags

[samuelkgutierrez]

Consider adding something like qv_scope_options(). This would allow for the setting of context-specific options before creation. A use-case I have in mind is setting an option that would allow for a standalone mode where starting a user-space daemon is handled automatically at startup. I'm sure there are other use-cases, but this one comes to mind.

A complication is that we would have to allocate a context and initialize its parameters and then be able to determine at qv_*_scope_get() time that the structure has already been allocated with options set. Maybe we can embed a magic value at the top of the structure to make this possible? Or we can add flags at creation time (this is probably the easiest/cleanest route).