PCA Server Manager 0.1.0

First release.

• Chat, /msg, /teammsg, /me, /say, signs, books and anvil item names are checked before anyone sees them, against a word list (plus web addresses), and logged.
• Chat can be turned off; commands still work and staff can always chat.
• /tell and /w removed; /msg is checked and logged.
• Logs of every message, command, join and leave in logs/pcaservermanager/.
• Friendly display names in chat, the tab list and above heads; friendly names work in commands (/tp John), with duplicates handled.
• Portal mode: launcher or PIN sign-in, attendance and session-time join checks, /attendance, whitelist from the register, the portal deciding every message (with an offline fallback and nothing lost), portal alerts in game, and the live web console.