added some phpstan-specific generic type annotations

tests/phpstan/configs/ds-bugs.neon

@@ -0,0 +1,9 @@
+parameters:
+	ignoreErrors:
+		-
+			message: "#^Cannot (access an|assign new) offset (on|to) Ds\\\\Deque\\<.+\\>\\.$#"
+			path: ../../../src
+
+		-
+			message: "#^Cannot (access|assign) offset (int|-?\\d+) (on|to) Ds\\\\Deque\\<.+\\>\\.$#"
+			path: ../../../src

tests/phpstan/configs/phpstan-bugs.neon

@@ -33,11 +33,6 @@ parameters:
 			count: 1
 			path: ../../../src/block/Liquid.php
 
-		-
-			message: "#^Cannot access an offset on Ds\\\\Deque&iterable\\<pocketmine\\\\block\\\\utils\\\\BannerPattern\\>\\.$#"
-			count: 1
-			path: ../../../src/block/tile/Banner.php
-
 		-
 			message: "#^Call to function assert\\(\\) with false and 'unknown hit type' will always evaluate to false\\.$#"
 			count: 1
@@ -54,11 +49,6 @@ parameters:
 			count: 1
 			path: ../../../src/item/ItemFactory.php
 
-		-
-			message: "#^Cannot access offset int on Ds\\\\Deque&iterable\\<pocketmine\\\\item\\\\WritableBookPage\\>\\.$#"
-			count: 2
-			path: ../../../src/item/WritableBookBase.php
-
 		-
 			#object to array cast analysis bug
 			message: "#^Call to function is_object\\(\\) with int will always evaluate to false\\.$#"