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/quest/Pickaxe.java

@@ -57,8 +57,7 @@ public class Pickaxe extends Weapon {
 		unique = true;
 		
 		defaultAction = AC_MINE;
-		
-		STR = 14;
+
 	}
 	
 	public boolean bloodStained = false;
@@ -73,6 +72,11 @@ public class Pickaxe extends Weapon {
 		return 12;
 	}
 
+	@Override
+	public int STRReq(int lvl) {
+		return 14;
+	}
+
 	@Override
 	public ArrayList<String> actions( Hero hero ) {
 		ArrayList<String> actions = super.actions( hero );