PvPIndex MCBans

Added

• Customizable kick messages - kick-message section in config.yml with per-type templates (global, local, temp, failsafe). Supports {reason}, {admin}, {expires}, and {appeal_url} placeholders plus an optional appeal-url appended automatically.
• Reason presets - reason-presets section in config.yml. Use #key in any ban command to expand to a full reason string (/ban <player> #hacks). Extended form supports a default-duration for use with /tban <player> #preset. Tab-completion suggests preset keys.
• Preset startup validation - invalid or misconfigured presets (missing reason field, bad duration format) are logged as warnings on load/reload.
• Case-insensitive preset keys - #Hacks, #HACKS, and #hacks all resolve to the same preset.
• Improved tab-completion for ban commands - preset #key suggestions appear at the reason position even on empty input (no need to type # first); sorted alphabetically; filtered case-insensitively.
• /mcbans presets command - lists all configured presets with their reason text and default duration at a glance. Requires mcbans.ban.local.
• Config bumped to ConfigVersion: 3; upgrading servers get their old config backed up automatically.