add generate username engine

if you can insert a file,
https://github.com/Kunzisoft/KeePassDX/issues/700

a good idea if you can also generate username by attaching list as text file. and automatically formats that username to lowercase without spaces without periods without any other letter marks.

in insertion section, separated between a list of male and female names.

sorry if it's a hassle, I use OpenHub app and there is no label feature. thanks.

Start by reading the referenced issue 700 and locating the insertion section. Clarify how a text-file name list should be attached and how male and female lists are separated. Done should mean generated usernames are lowercase and contain no spaces, periods, or other letter marks.

Written by the indexing model from the issue text.