Aiycrates

Fixes for issues found:
-Inventory flickering when opened.
-Visual or actual item duplication.
-Correct key item verification; now specifically checks for the "Key" enchantment.
-The "Rare" Crate had the wrong ID and has been updated; please retrieve the contents of any existing placed crates.
-The drop system should now work perfectly.

Additions: 1.1.0
-Redesigned models for crates (c, u, r, e, l, old).
-New rarities: mythical, sacred (including keys).
-Decorative block added: decorative crate.
-Setkey command: add Key to main hand's item

-Blocks added:
--Compound Block: A padlock that turns the block beneath it into a crate (can be made invisible).
--Custom Crate: A crate that can change its appearance between 10 variants using its specific item (only 3 custom designs available, sorry).
--Extend + half: Blocks used to open a crate across multiple blocks of distance; can be invisible ("half" is a slab placeable in any direction).

-Items added:
--Crate changer: Allows changing the appearance of the custom crate.
--Custom Keys: Additional keys, now in 3D (only 1 custom model available, sorry).

-New GUIs:
--Percent10: Configure the percentage for each of the 10 slots (includes a reset button to return to 0 or a base rate).
--Percent20: Configure the percentage for each of the 20 slots (clicking the 'X' while the GUI is open redirects to the default probability GUI—10 or 20).
--Crate50: Holds 50 items but selects a random drop from among them (e.g., 20 slots used = 1/20 chance per slot).