add getVarbitCount and warn instead of throw when varb doesnt exist

runescape-api/src/main/java/net/runelite/rs/api/RSAbstractArchive.java

@@ -7,4 +7,7 @@ public interface RSAbstractArchive extends IndexDataBase
 {
 	@Import("takeFile")
 	byte[] getConfigData(int archiveId, int fileId);
+
+	@Import("getGroupFileCount")
+	int getGroupFileCount(int group);
 }

runescape-api/src/main/java/net/runelite/rs/api/RSClient.java

@@ -457,6 +457,9 @@ public interface RSClient extends RSGameShell, Client
 	@Import("SpriteBuffer_spritePalette")
 	void setIndexedSpritePalette(int[] indexedSpritePalette);
 
+	@Import("archive2")
+	RSArchive getConfigArchive();
+
 	@Import("archive6")
 	RSArchive getMusicTracks();