Plan API 5.2-R0.5: More lenient TabInfo annotation usage

- No more warning when TabInfo is defined without Tab annotations.
  This is because builders can define tabs regardless.

Plan/api/build.gradle

@@ -4,7 +4,7 @@ dependencies {
     compileOnly "com.google.code.gson:gson:$gsonVersion"
 }
 
-ext.apiVersion = '5.2-R0.4'
+ext.apiVersion = '5.2-R0.5'
 
 publishing {
     repositories {

Plan/api/src/main/java/com/djrapitops/plan/extension/extractor/ExtensionExtractor.java

@@ -384,10 +384,6 @@ public final class ExtensionExtractor {
             if (tabName.length() > 50) {
                 warnings.add(extensionName + " TabInfo " + tabName + " 'name" + WAS_OVER_50_CHARACTERS);
             }
-
-            if (!tabNames.contains(tabName)) {
-                warnings.add(extensionName + " has TabInfo for " + tabName + ", but it is not used.");
-            }
         }
 
         // Check Tab name lengths