Deprecate model initializers

Too easy to misuse, instead us the `model(for:)` static
function, which is a little more secure (but will still
fail on different type sets reusing the same types).

Sources/ManagedModels/SchemaCompatibility/NSManagedObjectModel+Data.swift

@@ -11,6 +11,12 @@ public extension NSManagedObjectModel {
   // - encodingVersion
   // - version
 
+  @available(*, deprecated, renamed: "model(for:)", message:
+    """
+    Entities can only be used in one NSManagedObjectModel, use the `model(for:)`
+    static function to get access to s ahred, cached model.
+    """
+  )
   @inlinable
   convenience init(_ entities: NSEntityDescription...,
                    version: Schema.Version = Version(1, 0, 0))
@@ -19,13 +25,25 @@ public extension NSManagedObjectModel {
     self.entities = entities
   }
 
+  @available(*, deprecated, renamed: "model(for:)", message:
+    """
+    Entities can only be used in one NSManagedObjectModel, use the `model(for:)`
+    static function to get access to s ahred, cached model.
+    """
+  )
   convenience init(_ types: [ any PersistentModel.Type ],
                    version: Schema.Version = Version(1, 0, 0))
   {
     self.init()
     self.entities = SchemaBuilder.shared.lookupAllEntities(for: types)
   }
 
+  @available(*, deprecated, renamed: "model(for:)", message:
+    """
+    Entities can only be used in one NSManagedObjectModel, use the `model(for:)`
+    static function to get access to s ahred, cached model.
+    """
+  )
   @inlinable
   convenience init(versionedSchema: any VersionedSchema.Type) {
     self.init(versionedSchema.models,
@@ -39,8 +57,8 @@ public extension NSManagedObjectModel {
 private let lock = NSLock()
 private var map = [ Set<ObjectIdentifier> : NSManagedObjectModel ]()
 
-extension NSManagedObjectModel {
-  
+public extension NSManagedObjectModel {
+
   /// A cached version of the initializer.
   static func model(for types: [ any PersistentModel.Type ])
               -> NSManagedObjectModel
@@ -61,7 +79,8 @@ extension NSManagedObjectModel {
     let mom : NSManagedObjectModel
     if let cachedMOM { mom = cachedMOM }
     else {
-      mom = NSManagedObjectModel(types)
+      mom = NSManagedObjectModel()
+      mom.entities = SchemaBuilder.shared.lookupAllEntities(for: types)
       map[typeIDs] = mom
     }
     lock.unlock()