Add MMMRuntimeDiscoverable to help some Swift classes be visible from MMMAllClassesConformingNSObject()

Author: aleh

MMMCommonCore.podspec

@@ -6,7 +6,7 @@
 Pod::Spec.new do |s|
 
 	s.name = "MMMCommonCore"
-	s.version = "1.15.1"
+	s.version = "1.16.0"
 	s.summary = "Small bits and pieces reused in many pods from MMMTemple"
 	s.description =  s.summary
 	s.homepage = "https://github.com/mediamonks/#{s.name}"

Sources/MMMCommonCoreObjC/MMMCommonCore.h

@@ -305,4 +305,10 @@ extern BOOL MMMSeemsLikeEmail(NSString *email);
   * in `swift_dynamicCast` while working with `AnyClass`. */
 extern NSArray<Class> *MMMAllClassesConformingNSObject();
 
+/// Adding this protocol to Swift-only subclasses of Obj-C classes makes them visible in the list of all Obj-C classes
+/// produced by ``MMMAllClassesConformingNSObject()``. Swift can be too smart finding subclasses that are never used
+/// from Obj-C and thus not registering them with the runtime.
+@protocol MMMRuntimeDiscoverable <NSObject>
+@end
+
 NS_ASSUME_NONNULL_END