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/PcmStreamMixer.java

@@ -93,6 +93,7 @@ public class PcmStreamMixer extends PcmStream {
 	@ObfuscatedSignature(
 		signature = "()Ldx;"
 	)
+	@Export("firstSubStream")
 	protected PcmStream firstSubStream() {
 		return (PcmStream)this.subStreams.last();
 	}
@@ -101,6 +102,7 @@ public class PcmStreamMixer extends PcmStream {
 	@ObfuscatedSignature(
 		signature = "()Ldx;"
 	)
+	@Export("nextSubStream")
 	protected PcmStream nextSubStream() {
 		return (PcmStream)this.subStreams.previous();
 	}