PaperGuard 1.0.0

First release of PaperGuard, formerly PaperProxy-Bridge.

• Signed, replay-proof BungeeCord forwarding, one key per server, fail closed
• Paper 1.12.2+ and Folia, Java 8+
• Settings of PaperProxy-Bridge are taken over automatically
• paperguard-core: MIT library and protocol spec for other proxies