feat: ✨ Double chests

- double the number of inventory slots
- same number of upgrade slots as single chest
- is upgraded to next tier as a whole (and requires 2 tier upgrades in hand for that)
- gets packed as a whole and once packed drops as one item, which places the whole double chest

build.gradle

@@ -6,6 +6,13 @@ plugins {
     id 'org.parchmentmc.librarian.forgegradle' version '1.+'
 }
 
+idea {
+    module {
+        downloadJavadoc = true
+        downloadSources = true
+    }
+}
+
 if (findProject(':SophisticatedCore') != null) {
     evaluationDependsOn(':SophisticatedCore')
 }