Add Microsoft account support (#19)

* Add MSA support; fix up whatever IntelliJ complained about

* Add togglable password authentication option

src/main/resources/config.yml

@@ -25,6 +25,9 @@ geyser:
   # The port that will listen for connections
   port: 19133
 
+  # If password authentication should be allowed in online mode.
+  allow-password-authentication: true
+
   # If debug messages should be sent through console, has to be enabled in both places to work
   debug-mode: false
 

src/main/resources/proxy_config.yml

@@ -32,6 +32,7 @@ remote:
   port: 25565
   # Authentication type. Can be offline, online, or floodgate (see https://github.com/GeyserMC/Geyser/wiki/Floodgate).
   auth-type: online
+  allow-password-authentication: ALLOWPASSWORDAUTHENTICATION
 
 # Floodgate uses encryption to ensure use from authorised sources.
 # This should point to the public key generated by Floodgate (Bungee or CraftBukkit)