Chain Crafter

v0.0.0-beta.3 - Performance fix, duplicate-click fix, and a real button

Fix

• Severe lag opening a recipe in JEI, and when clicking "Craft Chain". On modpacks with thousands of registered crafting recipes, the resolver re-scanned the entire recipe list on every step of the ingredient chain - once when JEI built the recipe view, and once on the server for every click. It now builds a one-time lookup index instead, so both operations are fast regardless of modpack size.
• Clicking "Craft Chain" could craft the whole chain twice. JEI can rebuild the button under the hood while you're looking at a recipe; a duplicate click reaching a stale copy of the button could send the crafting request twice. The click guard is now shared correctly across those rebuilds, so a single click can never craft the chain more than once.

Changed

• The "Craft Chain" button now looks like a real button - vanilla's own beveled button style, with a pressed state, instead of the previous flat colored rectangle.