Creates a debug component, which may be used to print debug messages.

A debug component is named by the string name. It is either active or inactive.

The special component "all" may be used to control all components.

There is also a special component "backtrace" to control backtrace recording.

Useful when interacting with a component from code, typically when doing something more complicated than printing.

Note that the printer function prints some metadata compared to fun pp -> if get_flag flag then Feedback.msg_debug (pp ())

get_flags and set_flags use the user syntax: a comma separated list of activated "component" and "-component"s. get_flags starts with "all" or "-all" and lists all components after it (even if redundant).

Components not mentioned are not affected (use the "all" component at the start if you want to reset everything).