- removed spurious debug messages
- change config-option "applicable_on" to "applicableOn" for consistency
- change config-option "defenseModifier" to "armorModifier"
- added optional config-options "armorToughnessModifier" and "attackSpeedModifier" that both default to 0
- the menu has better visual effects
- menu title changed from "Chest" to "Upgrade"
- added the option to specify a number of cores via /getcore <name> [<amount>]
- fixed a bug where attributes would only be applied to weapons
- fixed a bug where the additional armor and armor-toughness would not be displayed correctly
- fixed a bug where all cores would be consumed, but only one upgrade would be possible
- fixed a bug where items would be upgradeable at max level
- fixed some naming consistencies

Upgrading Core + 1.4.2
Adds cores that you can upgrade weapons / armor with