PlayerTrust

    replaced framework's default config.yml creation with string-init code that actually works
    fixed pex groupname lookup bug
    fixed multiple-message bug on trusted player login
    added help message for unrecognized command
    added yml configurable prefs for standard player restrictions
    changed case problems in config yml by converting to camelcase
    removed RestrictedPlayers list in yml trust impl
    streamlined isOp() checking