define api for optional assistance functionalities

src/main/java/de/marhali/easyi18n/assistance/OptionalAssistance.java

@@ -0,0 +1,17 @@
+package de.marhali.easyi18n.assistance;
+
+import com.intellij.openapi.project.Project;
+
+import de.marhali.easyi18n.settings.ProjectSettingsService;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Used to define editor hooks as assistable.
+ * @author marhali
+ */
+public interface OptionalAssistance {
+    default boolean isAssistance(@NotNull Project project) {
+        return ProjectSettingsService.get(project).getState().isAssistance();
+    }
+}