Add some utility methods for names/uuids (taken from TrustCore).

Someone remind me of rendering TrustCore "uploadable" or to just upload
it.

NCPCore/src/main/java/fr/neatmonster/nocheatplus/utilities/IdUtil.java

@@ -0,0 +1,78 @@
+package fr.neatmonster.nocheatplus.utilities;
+
+import java.util.UUID;
+
+/**
+ * Utility for UUIDs, player names.
+ * @author mc_dev
+ *
+ */
+public class IdUtil {
+	
+	/**
+	 * Valid user name check (Minecraft).<br>
+	 * (Taken from TrustCore.)
+	 * @param name Allows null input.
+	 * @return
+	 */
+	public static boolean isValidMinecraftUserName(final String name) {
+		return name != null && name.matches("[\\w]{2,16}");
+	}
+	
+	/**
+	 * Safe method to parse a UUID, using UUIDFromString internally.
+	 * @param input
+	 * @return
+	 */
+	public static UUID UUIDFromStringSafe(final String input) {
+		if (input == null) {
+			return null;
+		}
+		try {
+			return UUIDFromString(input);
+		}
+		catch (IllegalArgumentException e1) {}
+		return null;
+	}
+	
+	/**
+	 * More flexible UUID parsing.<br>
+	 * (Taken from TrustCore.)
+	 * @param input
+	 * @return
+	 */
+	public static UUID UUIDFromString(final String input) {
+		// TODO: Add unit tests.
+		final int len = input.length();
+		if (len == 36) {
+			return UUID.fromString(input);
+		} else if (len == 32) {
+			// TODO: Might better translate to longs right away !?
+			// Fill in '-'
+			char[] chars = input.toCharArray();
+			char[] newChars = new char[36];
+			int index = 0;
+			int targetIndex = 0;
+			while (targetIndex < 36) {
+				newChars[targetIndex] = chars[index];
+				index ++;
+				targetIndex ++;
+				switch (index) {
+    				case 8:
+    				case 12:
+    				case 16:
+    				case 20:
+    					newChars[targetIndex] = '-';
+    					targetIndex ++;
+    					break;
+					default:
+						break;
+				}
+			}
+			return UUID.fromString(new String(newChars));
+		} else {
+			throw new IllegalArgumentException("Unexpected length (" + len + ") for uuid: " + input);
+		}
+	}
+	
+}