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/class3.java

@@ -111,9 +111,8 @@ public class class3 implements Enumerated {
 
 		if (var1 == null) {
 			throw new IllegalArgumentException();
-		} else {
-			return var1.field13;
 		}
+		return var1.field13;
 	}
 
 	@ObfuscatedName("e")