This moves the module-level lookup and creation functions to the
types, which make the naming more consistent. Now the lookup_* get_*
and create_* functions all behave similarly.
Peraps even more important the API of the lookup now allows
distinguishing failure from not found. This in turn is important to
be able to remove reliance on a ChatId with a 0 or "unset" value. The
locations where this ChatId(0) is still used is in database queries
which should be solved in an independed commit.
Switches from rusqlite to sqlx to have a fully async based interface
to sqlite.
Co-authored-by: B. Petersen <r10s@b44t.com>
Co-authored-by: Hocuri <hocuri@gmx.de>
Co-authored-by: link2xt <link2xt@testrun.org>
- doc fixes
- make BobStateHandle safer by moving the state out of the handle.
- handle more match cases explicit in BobState returns
- fewer mutable variables
This does not only organise things better, but most importantly the
BobStateHandle is now not in the same module as its users. This means
it can guarantee safety about how it is initialised and use
unreachable!() to simplify it's API.
