Commits on Mar 27, 2020

1. [FEAT] Modifier Managers …

   Adds modifier managers that match Ember's modifier manager API. They can
   be defined by importing `setModifierManager` from `@glimmer/core`:
   
   ```ts
   import {
     modifierCapabilities,
     setModifierManager,
   } from '@glimmer/core';
   ```
   
   Also allows users to use simple functions as modifiers:
   
   ```js
   function scroll(element, position) {
     element.scrollY = position;
   
     return () => element.scrollY = 0;
   }
   ```
   
   The function receives the element as the first argument, and any
   positional arguments after that. It can return a destructor, which will
   be called whenever the modifier is destroyed, or before it is updated
   and the modifier is run again.
   
   Also adds a `TrackedObject` implementation for tests, which makes life
   for testing a bit easier.

   Chris Garrett committed Mar 27, 2020
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