Revert "[aml] introduce guisettings overrides (v2)"

This reverts commit c6e72e87bf1071cd2ea78b9a6375f9e3a718ce53.
[aml] introduce guisettings overrides

This is useful for packagers as they can override menu defaults in as.xml
rather than patching xbmc code.

Usage example:

  <hidesettings>
    <setting>lookandfeel.soundskin</setting>
    <setting>videoplayer.rendermethod</setting>
  </hidesettings>