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#9443 IRCClient: Allow trying message decoding with multiple codecs

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## Scope and purpose The IRC protocol doesn't specify encoding, so occasionally codecs other than "utf-8" are used. This patch allows IRCClients to specify multiple possible codecs to use when...

Option to disable confirmation dialog for connecting to/disconnecting from all networks

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Confirmation dialogs can annoy users so this PR gives users the ability to disable the confirmation dialog for connecting to/disconnecting from all networks. I'm not sure if the AppearanceSettingsPage is...