Make AbstractItem.itemSet final, so that Item.setItemSet can be removed
Replace sequential string comparizon with a faster hash lookup during
AST creation
Even more compiler and static analyzer warnings eliminated
Cheaper explicit boxing: new Integer -> Integer.valueOf and new
Character -> Character.valueOf
Use inline constants instead of short array and Map
JBIDE-17910 Assign and List directive fixes and tests
Fix use of deprecated APIs in Plugin class