Revert "[aml] grab as.xml from current profile rather than master"

This reverts commit 6de37aeb030b544eca4f27c3f54c11bf06b63891.
Revert "[aml] introduce guisettings overrides"

This reverts commit 37502b1a71a04b606c0852e857e8183904d0bb95.
introduce guisettings overrides (v2)

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>