fix: parse boolean and int attributes value

[amihalj]

Considering example:

<div
  class="lazyframe"
  data-vendor=""
  data-title=""
  data-thumbnail=""
  data-src=""
  data-ratio="1:1"
  data-initinview="false"
  data-autoplay="false"
></div>

Even-though data-autoplay="false" autoplay will be considered as true due to string value. This results in all attributes being evaluated as strings.

explicitly examing ['autoplay','initinview'] as boolean and ['debounce'] as integer will values passed as attributes correspond to preferred types