Mark ViaPlatform#isPluginEnabled as deprecated (#4313)

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -41,7 +41,7 @@ body:
         Describe the unexpected behavior.
         If you want to attach screenshots, use the comment field at the bottom of the page.
       placeholder: |
-        Example: "Placing signs on 1.13.2 causes text to disappear."
+        Example: "Placing signs on 1.21.3 causes text to disappear."
     validations:
       required: true
 

api/src/main/java/com/viaversion/viaversion/api/platform/ViaPlatform.java

@@ -163,7 +163,10 @@ public interface ViaPlatform<T> {
      *
      * @return True if it is enabled
      */
-    boolean isPluginEnabled();
+    @Deprecated(forRemoval = true)
+    default boolean isPluginEnabled() {
+        return true;
+    }
 
     /**
      * Get the API for this platform