fix: delay imports from `wuttjamaican.db`

in case sqlalchemy is not installed

test: improve some tests, docs for `rattail.config` module

still some left to do, just a stopping point

fix: deprecate `parse_bool()` and `parse_list()` in `rattail.config`

those are provided by `wuttjamaican.util` now instead, but also the
`RattailConfig` methods

fix: remove duplicated / unused code for `rattail.db.config`

also remove imported names from `rattail.db.util`

feat: remove legacy command system

we now use Typer commands instead

docs: add some basic docs for typer commands

remove some docs for legacy commands

fix: allow config override of "problems" for postfix-summary

since in practice, 'rejected' happens rather often and is not worth
looking into. maybe want to avoid that by default but at least with
this change it can be explicitly avoided per install via config

fix: read logs from journald by default, for postfix-summary

since newer systems no longer have a `/var/log/mail.log` file, but
keep the option to specify a file for older systems

fix: truncate invoice item description for receiving, if needed

the vendor invoice has varchar(255) but purchase has varchar(60)
..maybe should align those at some point?

fix: revert back to setup.py + setup.cfg

apparently with python 3.6 things "mostly" work but then they break if
any specified dependencies have a dot in the name. which in this
project, is the case for `flufl.bounce`

so until we drop python 3.6 support, we cannot use pyproject.toml here

build: fix project license attribute

avoid including the full license text

docs: incorporate old changelog into doc structure

otherwise sphinx complains, which means an error with tox build

fix: use latest wuttjamaican

also ignore temp files etc.

feat: add `get_pkg_version()` convenience function

this is only needed until we can require python 3.8+

Define the `-n` command flag as alias for `--no-init`

for backward compatibility

Remove old/unused project scaffold template

was previously used with command, `pcreate -s rattail`

but newer Generate Project feature in tailbone, using the
ProjectHandler for logic, is a better way

Log the `pflogsumm` command before running it

for help with troubleshooting

Add `--dry-run` flag for `rattail version-check`

whoops not sure why that got missed

Fallback to null if include/exclude not specified in backup command

otherwise empty set is passed and prevents config values from being used

Bump version for wuttjamaican lib

need the latest

Fix docs for `rattail make-appdir` command

per typer

Fix broken test for trainwreck handler

but not sure exactly why it broke, or this fixes..shrug

Whoops can't remove subcommand entry points just yet

need these just in case we have to revert in emergency etc.

Add command logic functions for running reports, purging things

for use with typer commands

Remove broken tests

since they didn't test anything meaningful..

Add all `rattail-cli` commands using typer

these will "soon" be wired up as `rattail` but one thing at a time

Revert "Fix broken test"

This reverts commit b6d06fabd8f902a228a884e6bcde2a6af1fd56f5.

Fix start/end date params for importer commands

do not want datetime for those

Add `required` kwarg for `AppHandler.get_runas_user()`

false by default, so no error unless caller wants one

Add basic support for `typer` command system

only using this for derivative projects so far..proper rattail
commands will be migrated last probably

Require latest wuttjamaican

since tox doesn't want to fetch latest available, must force it here

Move "import command runner" logic to separate handler

to allow for other command systems to invoke same logic

Move `finalize_session()` function to `db.util` module

and delegate to that, from similar Subcommand method

for sake of sharing logic with other contexts

Move rich and prompt_toolkit things to separate module

for use outside of classic subcommand context

Add `get_runas_user()` method for AppHandler

and delegate to that, within similar Subcommand method

this is part of an effort to incorporate the `typer` lib as a
replacement for rattail "native" command framework