move register to init for now

dash line update temporary for legacy

MVMCore/MVMCore/Session/MVMCoreSessionObject.m

@@ -16,12 +16,12 @@
 - (instancetype)init {
     if (self = [super init]) {
         self.session = [self createNSURLSession];
+        [ModelMapping registerObjects];
     }
     return self;
 }
 
 + (nullable instancetype)sharedGlobal {
-    [ModelMapping registerObjects];
     return [MVMCoreActionUtility initializerClassCheck:[MVMCoreObject sharedInstance].session classToVerify:self];
 }