make server browser remember last used password for every server

[commy2]

Clan got annoyed entering the same password twice a week. Therefore:

When merged this pull request will:

• make the serverbrowser remember the last used password for every server

The passwords are saved in profile, and could theoretically read by malicious scripts. There is a client only setting (ADDON OPTIONS -> CBA UI) to change the saving behavior for security reasons. No one should care about game server passwords, but whatever, here it is:

• Save passwords (default)
  -- passwords are stored when connecting to a multiplayer server
  -- stored passwords are automatically entered when trying to connect to a previous server

• Do not save passwords
  -- passwords are not stored when connecting to a multiplayer server
  -- already stored passwords will not be automatically entered

• Delete passwords
  -- passwords are not stored when connecting to a multiplayer server
  -- already stored passwords will not be automatically entered
  -- already stored passwords are deleted from the profile