title: vscode global keyboard shortcuts overriding in extension
body: <p>I have a set of keybindings in <code>package.json</code>,</p>
  
  <pre class="lang-json prettyprint-override"><code>{
       "command": "md.image",
       "key": "Ctrl+Shift+i"
  }, {
      "command": "md.codeblocks",
      "key": "Ctrl+Shift+B"
  }
  </code></pre>
  
  <p>This has a problem with other global keyboard shortcuts in vscode, I want to have this overridden in the extension so these keyboards act as the current keyboard mappings for the language its loaded for.</p>
  
  <p>Is this possible?</p>