This also fixes a bug where the port script would explode when it
encountered the newly added boolean column
`public_room_list_stream.visibility`

Signed-off-by: Kent Shikama <kent@kentshikama.com>

Replace the bash/perl gen_password script with a python one, and write a note
on how to use it.

Seperate scripts/ into scripts/ and scripts-dev/, where scripts/* are automatically added to the package