A deterministic password manager/generator
User can specify length of output password, character set to use, and password update counter.
Character sets:
l: abcdefghijklmnopqrstuvwxyz
u: ABCDEFGHIJKLMNOPQRSTUVWXYZ
d: 0123456789
s: `~!@#$%^&*()-_=+[{]}\|;:'",<.>/?