fix(network): prevent null multiplayer peer crashes offline/teardown and fix Nakama RPC session validation

test_suite/utils/config.gd

@@ -0,0 +1,22 @@
+extends Node
+
+var HOST = "127.0.0.1"
+var PORT = 7350
+var SCHEME = "http"
+var SERVER_KEY = "defaultkey"
+
+func _ready():
+	var f = FileAccess.open("res://settings.json", FileAccess.READ)
+	if not f:
+		return
+	var json = JSON.new()
+	var error = json.parse(f.get_as_text())
+	var parsed = json.get_data()
+	if error != OK or typeof(parsed) != TYPE_DICTIONARY:
+		return
+	for k in parsed:
+		match k:
+			"HOST": HOST = parsed[k]
+			"PORT": PORT = parsed[k]
+			"SCHEME": SCHEME = parsed[k]
+			"SERVER_KEY": SERVER_KEY = parsed[k]