They were private and [deprecated] protected methods used by an already
removed API for setting the clock and reset of a Module from the
outside.

Mixing in these traits enables overriding the implicit clock or reset
from within a Module.

Module's logic that creates the implicit clock and implicit reset within
the Module's body is now implemented in new traits that users are free
to mix in to RawModule. There are also now virtual methods implicitClock
and implicitReset that the user can override to change what clock or
reset is used.