First look at making entity creation closure-driven

this allows doing stuff like injecting plugin references to entity constructors for now. I want to make this more flexible still, but I've done about as much as I feel like doing today and don't want this disappearing into a stash to never be seen again.

tests/phpstan/configs/phpstan-bugs.neon

@@ -20,6 +20,16 @@ parameters:
 			count: 3
 			path: ../../../src/command/CommandReader.php
 
+		-
+			message: "#^Closure invoked with 2 parameters, at least 3 required\\.$#"
+			count: 1
+			path: ../../../src/entity/EntityFactory.php
+
+		-
+			message: "#^Only iterables can be unpacked, mixed given in argument \\#3\\.$#"
+			count: 6
+			path: ../../../src/entity/EntityFactory.php
+
 		-
 			message: "#^Call to function assert\\(\\) with false and 'unknown hit type' will always evaluate to false\\.$#"
 			count: 1