Customizable character sets

[ashwind1]

Various sites require characters from a "special" that is a subset of passwordgenerator's special character set. It can take dozens of versions to get a satisfying password.

It would be nice to be able to specify which characters (especially from the special set) we want to include. For example, we could specify:

Allowed: "!@#$%^&*()" + lower + upper + numbers

which would not return passwords that contain "-_=+[{]}|;:'",<.>/?"