[no changelog]
* passed in directory respects absolute and relative paths instead of
working "from repository root"
* we don't require the enableTypeIgnoreComments to be set so both
`pyright` and `pyright_tool` can work with the same config at the same
time
* use click's magic functionality to deal with missing / unreadable /
unwriteable files
* read the error results via a pipe, do not write to filesystem unless
requested
* simplified logic regarding "test mode"/"dev mode"
* renamed `--log` to more typical `--verbose`
* use pathlib more extensively
