remove unused test classes, fix new array creation in mixins

src/test/java/net/runelite/rs/api/RSInterface.java

@@ -1,5 +0,0 @@
-package net.runelite.rs.api;
-
-public interface RSInterface
-{
-}

src/test/java/net/runelite/rs/api/RSTest.java

@@ -1,20 +0,0 @@
-package net.runelite.rs.api;
-
-import javax.inject.Inject;
-import net.runelite.mapping.Import;
-
-public interface RSTest extends RSInterface
-{
-	@Import("test1")
-	void setTest1(String test1);
-
-	@Import("test1")
-	String getTest1();
-
-	@Import("test2")
-	@Inject
-	void invokeTest2(String var1, int var3, String var2);
-
-	@Import("test3")
-	void setTest3(String test1);
-}