Fixed core issue of book errors.

Fixed:
- Writable and written books that contained illegal unicode that SnakeYAML (inside Spigot/Bukkit) could not save caused an big error. This fixes it by saving to a new Test-File.yml and checks if it was able to be saved and if not denies that book.

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>me.badbones69</groupId>
     <artifactId>crazyauctions</artifactId>
-    <version>1.2.14</version>
+    <version>1.2.15</version>
     <name>CrazyAuctions</name>
 
     <properties>

src/main/java/me/badbones69/crazyauctions/Main.java

@@ -19,6 +19,7 @@ import org.bukkit.inventory.meta.BookMeta;
 import org.bukkit.permissions.PermissionAttachmentInfo;
 import org.bukkit.plugin.java.JavaPlugin;
 import org.bukkit.scheduler.BukkitRunnable;
+import org.yaml.snakeyaml.error.YAMLException;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -466,6 +467,15 @@ public class Main extends JavaPlugin implements Listener {
     
     private boolean allowBook(ItemStack item) {
         if (item != null && item.hasItemMeta() && item.getItemMeta() instanceof BookMeta) {
+            System.out.println("[Crazy Auctions] Checking " + item.getType() + " for illegal unicode.");
+            try {
+                Files.TEST_FILE.getFile().set("Test", item);
+                Files.TEST_FILE.saveFile();
+                System.out.println("[Crazy Auctions] " + item.getType() + " has passed unicode checks.");
+            } catch (YAMLException e) {
+                System.out.println("[Crazy Auctions] " + item.getType() + " has failed unicode checks and has been denied.");
+                return false;
+            }
             return ((BookMeta) item.getItemMeta()).getPages().stream().mapToInt(String :: length).sum() < 2000;
         }
         return true;

src/main/java/me/badbones69/crazyauctions/api/FileManager.java

@@ -54,7 +54,7 @@ public class FileManager {
                     String fileLocation = file.getFileLocation();
                     //Switch between 1.12.2- and 1.13+ config version.
                     if (file == Files.CONFIG) {
-                        if (Version.getCurrentVersion().isOlder(Version.v1_13_R2)) {
+                        if (Version.isOlder(Version.v1_13_R2)) {
                             fileLocation = "config1.12.2-Down.yml";
                         } else {
                             fileLocation = "config1.13-Up.yml";
@@ -292,7 +292,8 @@ public class FileManager {
         //ENUM_NAME("FileName.yml", "FilePath.yml"),
         CONFIG("config.yml", "config.yml"),
         DATA("Data.yml", "Data.yml"),
-        MESSAGES("Messages.yml", "Messages.yml");
+        MESSAGES("Messages.yml", "Messages.yml"),
+        TEST_FILE("Test-File.yml", "Test-File.yml");
         
         private String fileName;
         private String fileLocation;

src/main/resources/Test-File.yml

@@ -0,0 +1,2 @@
+#!!DO NOT DELETE!!
+#Used for unicode checking in books.