GemXp

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Added transfer loss (experience points tax);
Implementation of stack handling to fixes some weird stacking behavior when combining gem stacks together or "shift clicking" a stack in an inventory;
Now gems drops when the inventory is full instead of displaying an error message.
Added effects when restoring a gem;
New configuration for costume messages;
Mutable gems: one item id for empty gems and another for filled gems (can be the same and is configurable);
Better stack handling: gems will stack properly when used.
Added effects when storing XP in a gem;
fix bug: XP bar and level visual doesn't update properly sometimes;
Can use stacks of gems;
New messages colors!;
Enabling use of items (like chests) when having a gem in hand.

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