v0.4.0: Refactored strength requirements, also changed how they scale

Also refactored class armor a bit so that it is upgradeable

src/com/shatteredpixel/shatteredpixeldungeon/items/weapon/missiles/IncendiaryDart.java

@@ -36,8 +36,6 @@ public class IncendiaryDart extends MissileWeapon {
 
 	{
 		image = ItemSpriteSheet.INCENDIARY_DART;
-		
-		STR = 12;
 	}
 
 	@Override
@@ -50,6 +48,11 @@ public class IncendiaryDart extends MissileWeapon {
 		return 2;
 	}
 
+	@Override
+	public int STRReq(int lvl) {
+		return 12;
+	}
+
 	public IncendiaryDart() {
 		this( 1 );
 	}