Auto register simple inner components in templates

[krampstudio]

Let's say :

fw('menu')
   .content( data => `
      <f-menuitem level="1">foo</f-menuitem>
      <f-menuitem level="2">foo</f-menuitem>
  `)
  .register()

would register in the behind

fw('f-menuitem')
   .attrs('level')
  .register()

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