In this commit, I provide further functions which generate the
existing set of data types:
- key_components_add_text_pl() adds a text component, but takes a
ptrlen rather than a const char *, in case that was what you
happened to have already.
- key_components_add_uint() ends up adding an mp_int to the
structure, but takes it as input in the form of an ordinary C
integer, for the convenience of call sites which will want to do
that a lot and don't enjoy repeating the mp_int construction
boilerplate
- key_components_add_copy() takes a pointer to one of the
key_component sub-structs in an existing key_components, and copies
it into the output key_components under a new name, handling
whatever type it turns out to have.
180d1b78de