Add filter support to ExprItemsIn

[Pikachu920]

Description

Adds supports to get only certain item types when using ExprItemIn (e.g. all swords in player's inventory). Marking as draft because I haven't contributed for a while and am not sure on Skript code style and new APIs. Particularly, I would appreciate a double check of test script and my ItemType comparison (in matchesTypeFilter) as it currently acts funky with named/enchanted items.

To-do:

• [x] Ensure proper method is being used for itemtype comparison
• [x] Ensure expression works as expected with named/enchanted/etc items
• [x] Test iterator method more
• [x] Ensure test script functions properly

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Target Minecraft Versions: All Requirements: None Related Issues: #4612

[Pikachu920]

have a sec to review pls? @APickledWalrus

[Pikachu920]

Addressed reviews, but this is now pending #5077 as the test is failing due to an NPE in ExprSets

[TheLimeGlass]

ExprXOf.sk is failing when it shouldn't be. Changes made in this pull request have affected that test.