docs: added some comments about tokens, verify, test mode, etc

Mage.Client/src/main/java/org/mage/card/arcane/CardPanelRenderModeMTGO.java

@@ -23,9 +23,13 @@ import java.util.concurrent.TimeUnit;
 
 /**
  * Render mode: MTGO
+ *
  */
 public class CardPanelRenderModeMTGO extends CardPanel {
 
+    //
+    // https://www.mtg.onl/evolution-of-magic-token-card-frame-design/
+
     // Map of generated images
     private final static Cache<ImageKey, BufferedImage> IMAGE_CACHE = CacheBuilder
             .newBuilder()

Mage.Client/src/main/java/org/mage/card/arcane/ModernCardRenderer.java

@@ -55,6 +55,7 @@ import static org.mage.card.arcane.ManaSymbols.getSizedManaSymbol;
  * @author stravant@gmail.com, JayDi85
  * <p>
  * Base rendering class for new border cards
+ * M15 frame style, for another styles see https://www.mtg.onl/evolution-of-magic-token-card-frame-design/
  */
 public class ModernCardRenderer extends CardRenderer {
 

Mage.Client/src/main/java/org/mage/plugins/card/dl/sources/AltMtgOnlTokensImageSource.java

@@ -10,6 +10,10 @@ import java.util.List;
 import java.util.Map;
 
 /**
+ *  * TODO: web site reworked and tokens doesn't work anymore,
+ *  *  but it can be used to download a proxy tokens (tokens that was miss by wizards),
+ *  *  see https://www.mtg.onl/mtg-missing-tokens/
+ *
  * @author spjspj
  */
 public enum AltMtgOnlTokensImageSource implements CardImageSource {

Mage.Client/src/main/java/org/mage/plugins/card/dl/sources/MtgOnlTokensImageSource.java

@@ -10,6 +10,10 @@ import java.util.List;
 import java.util.Map;
 
 /**
+ * TODO: web site reworked and tokens doesn't work anymore,
+ *  but it can be used to download a proxy tokens (tokens that was miss by wizards),
+ *  see https://www.mtg.onl/mtg-missing-tokens/
+ *
  * @author spjspj
  */
 public enum MtgOnlTokensImageSource implements CardImageSource {

Mage.Server/src/main/java/mage/server/Main.java

@@ -67,10 +67,11 @@ public final class Main {
     public static final PluginClassLoader classLoader = new PluginClassLoader();
     private static TransporterServer server;
 
-    // special test mode:
+    // Special test mode:
     // - fast game buttons;
     // - cheat commands;
     // - no deck validation;
+    // - load any deck in sideboarding;
     // - simplified registration and login (no password check);
     // - debug main menu for GUI and rendering testing (must use -debug arg for client app);
     private static boolean testMode;
@@ -412,7 +413,9 @@ public final class Main {
 
         @Override
         public Object invoke(final InvocationRequest invocation) throws Throwable {
-            // Called for every client connecting to the server (after add Listener)
+            // called for every client connecting to the server (after add Listener)
+
+            // save client ip-address
             String sessionId = invocation.getSessionId();
             Map map = invocation.getRequestPayload();
             String host;

Mage.Verify/src/test/java/mage/verify/VerifyCardDataTest.java

@@ -1376,6 +1376,7 @@ public class VerifyCardDataTest {
                 // Possible reasons:
                 // - promo sets with cards without tokens (nothing to do with it)
                 // - miss set from tok-data (must add new set to tok-data and scryfall download)
+                // - wizards miss some paper printed token, see https://www.mtg.onl/mtg-missing-tokens/
                 warningsList.add("info, set's cards uses tokens but tok-data haven't it: "
                         + setCode + " - " + sourceCards.stream().map(MageObject::getName).collect(Collectors.joining(", ")));
             } else {