Enable parsing/emitting .properties without creating a Config object

this is useful when the contents are just going to get passed straight into a model, making Config object redundant anyway.

tests/phpstan/configs/check-explicit-mixed-baseline.neon

@@ -165,6 +165,11 @@ parameters:
 			count: 1
 			path: ../../../src/timings/TimingsHandler.php
 
+		-
+			message: "#^Parameter \\#1 \\$config of static method pocketmine\\\\utils\\\\Config\\:\\:writeProperties\\(\\) expects array\\<string, bool\\|float\\|int\\|string\\>, array\\<string, mixed\\> given\\.$#"
+			count: 1
+			path: ../../../src/utils/Config.php
+
 		-
 			message: "#^Parameter \\#2 \\$offset of function substr expects int, mixed given\\.$#"
 			count: 1