Improve Item Frames

[TheLimeGlass]

Description

Improves Item Frames as Snow always wanted.

Sets the entity data pattern to

item[ ]frame(|1¦s) [(with|of) %-itemtype%] [[with rotation|rotated] %-rotation%]

for more proper support of ItemFrames while also registering ItemFrames as a classinfo for dedicated syntaxes.
Adds org.bukkit.Rotation and a utility effect for easily rotating an expression that returns a rotation and/or itemframes and rotation's self.

This enhancement was more work than I expected, so it's a decently sized pull request.

Todo

• Glowing Item Frame support inside ItemFrameData.
• All methods from https://hub.spigotmc.org/javadocs/spigot/org/bukkit/entity/ItemFrame.html waiting on Adds a SetEffect lang util class #5219 for boolean syntaxes.
• Maybe some block face directions to make spawning of item frames easier.
• Loading order between SkriptClasses and BukkitClasses is broken as Aliases loads before BukkitClasses. Needs testing after loading BukkitClasses with SkriptClasses. Cannot currently use %-rotation% in default.lang file when it's in BukkitClasses.

Examples:

# Spawning
spawn an item frame with lime stained glass rotated 225 degrees at target block
spawn an item frame of stone rotated 90 degrees in the direction of player from target block:
    rotate event-item frame by 90 degrees
    set item of event-item frame to lime stained glass named "example"

# EffRotate
rotate the event-item frame clockwise 2 times
rotate the event-item frame by 225 degrees

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Target Minecraft Versions: any
Requirements: none
Related Issues: #414 (non-closing) and #2874

[sovdeeth]

Closing due to inactivity.

[APickledWalrus]

Needs updated/conflicts resolved after Displays. ExprItemFrameSlot was replaced: https://github.com/SkriptLang/Skript/blob/dev/feature/src/main/java/org/skriptlang/skript/bukkit/misc/expressions/ExprItemOfEntity.java

[TheLimeGlass]

Updated #7749