macos window title/size

* add macOS implmentation for oc_window_set_title()
* move implementation of oc_window_set_content_size() to a block that
  is guaranteed to run on the main thread

src/app/osx_app.m

@@ -1471,6 +1471,29 @@ bool oc_window_is_focused(oc_window window)
     }
 }
 
+void oc_window_set_title(oc_window window, oc_str8 title)
+{
+    dispatch_block_t block = ^{
+      @autoreleasepool
+      {
+          oc_window_data* windowData = oc_window_ptr_from_handle(window);
+          if(windowData)
+          {
+              windowData->osx.nsWindow.title = [[NSString alloc] initWithBytes:title.ptr length:title.len encoding:NSUTF8StringEncoding];
+          }
+      }
+    };
+
+    if([NSThread isMainThread])
+    {
+        block();
+    }
+    else
+    {
+        dispatch_sync(dispatch_get_main_queue(), block);
+    }
+}
+
 bool oc_window_is_minimized(oc_window window)
 {
     @autoreleasepool
@@ -1634,9 +1657,9 @@ oc_rect oc_window_get_content_rect(oc_window window)
 
 void oc_window_set_content_rect(oc_window window, oc_rect rect)
 {
+    dispatch_block_t block = ^{
       @autoreleasepool
       {
-
           oc_window_data* windowData = oc_window_ptr_from_handle(window);
           if(windowData)
           {
@@ -1652,6 +1675,16 @@ void oc_window_set_content_rect(oc_window window, oc_rect rect)
               [windowData->osx.nsWindow setFrame:frameRect display:YES];
           }
       }
+    };
+
+    if([NSThread isMainThread])
+    {
+        block();
+    }
+    else
+    {
+        dispatch_sync(dispatch_get_main_queue(), block);
+    }
 }
 
 //--------------------------------------------------------------------