Add managers for Nicks and Kick messages

[Pugzy]

Adds two cross-service listener managers: one to strip Community nicks from match participants, one to send a rejoin message to players who are kicked mid-match.

NickManager

• Removes a player's Community nick when they join a match as a participant
• Uses isPluginEnabled("Community") guard via NickUtils so the plugin loads cleanly without Community present
• Checks event.getNewParty() instanceof Competitor instead of a ranked-specific player list, making it work across all service types (RANKED, PUG, TM, DRAFT)
• Registered globally in MatchManager rather than scoped to RankedManager

KickMessageManager

• Sends a rejoin server message (with separators) to participants who are kicked from the server during a match
• Registered globally in MatchManager
• Allows players who were kicked for being idle/afk to rejoin with a message click