Improve context menu handling in resource-manager

[valadas]

The resource-manager context menus are currently driven by some convoluted logic to fire events from one so others can catch those events to close themselves. At the time, my attention was not totally focused on thinking we would have them in different contexts and this causes some odd behaviours in some sequence of clicks.

There is a super simple way though to make this both simple and more robust, when basically any click outside a context menu just closes it... The code would look something like this:

@Listen('mousedown', { target: 'document' })
  handleOutsideClick(event: MouseEvent) {
    const path = event.composedPath();
    if (!path.includes(this.el)) {
      this.closeDropdownMenu();
    }
  }