til_settings: add an optional til_settings_t.prefix

Preparatory commit for bridging the gap separating a baked
til_setup_t from a runtime-populated descendant til_settings_t
like modules::rtv produces for its channels via
til_module_setup_randomize().

For these currently orphaned til_settings_t instances we don't
readily have access to the logical ancestor til_settings_t that
was used to produce the module_context's bound til_setup_t.  But
we don't really need the ancestor til_settings_t, all we _really_
want is the ancestral path to prefix the orphan til_settings_t
instances.

So this commit introduces supplying a prefix which gets prepended
to paths printed via the settings instance.  A later commit will
make use of this in modules::rtv when producing the settings
instance passed to til_module_setup_randomize()

0 files changed, 0 insertions, 0 deletions