Pushed missing files

Started adding Replay Editor using johni0702's excellent ReplayStudio Library
Added fully functional GuiDropdown GUI Element (useable in other projects as well)

src/main/java/eu/crushedpixel/replaymod/studio/VersionValidator.java

@@ -0,0 +1,20 @@
+package eu.crushedpixel.replaymod.studio;
+
+public class VersionValidator {
+
+	public static final boolean isValid;
+	
+	static {
+		String version = Runtime.class.getPackage().getSpecificationVersion();
+		if(version != null) {
+			String[] split = version.split("\\.");
+			if(split.length > 1) {
+				isValid = Integer.valueOf(split[1]) >= 7;
+			} else {
+				isValid = false;
+			}
+		} else {
+			isValid = false;
+		}
+	}
+}