rs-client: Cleanup (#1087)

* rs-client: name SpriteBuffer

* rs-client: (re)name spritebuffer methods

* rs-client/deob: Add missed @Export's, make updatemappings fix this next time

* rs-client: run intellij redundant else inspection

* rs-client: invert some script interpreter if's

* deob: checkstyle fixes

* rs-client: SpriteBuffer_loadSprite -> SpriteBuffer_bufferFile

runescape-client/src/main/java/FriendsList.java

@@ -65,9 +65,8 @@ public class FriendsList extends UserList {
 		Friend var3 = (Friend)this.getByUsername(var1);
 		if (var3 == null) {
 			return false;
-		} else {
-			return !var2 || var3.world != 0;
 		}
+		return !var2 || var3.world != 0;
 	}
 
 	@ObfuscatedName("c")