Handle client PASS messages that contain spaces and/or a leading colon.HEADmaster

1. The password is a freeform string that might contain spaces anywhere, so use the raw string rather than the space-separated tokens.
2. If there is a leading colon then always strip it:
   a) Some clients always send one.
   b) Some clients send one if the password contains a space or has a leading colon itself.
   c) Clients that don't send one if the password contains a leading colon won't work unless the user uses two leading colons.

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