Added selection observing arraycontroller, moved block based calls into view controllers again

MacPass/MPArrayController.m

@@ -0,0 +1,26 @@
+//
+//  MPArrayController.m
+//  MacPass
+//
+//  Created by Michael Starke on 30/08/16.
+//  Copyright © 2016 HicknHack Software GmbH. All rights reserved.
+//
+
+#import "MPArrayController.h"
+#import "MPDocument.h"
+
+@implementation MPArrayController
+
+
+- (void)setValue:(id)value forKeyPath:(NSString *)keyPath {
+  if([keyPath hasPrefix:@"selection."]) {
+    [self.document willChangeModelProperty];
+    [super setValue:value forKeyPath:keyPath];
+    [self.document didChangeModelProperty];
+  }
+  else {
+    [super setValue:value forKeyPath:keyPath];
+  }
+}
+
+@end