* Allow high image ids when rendering an inline sprite
* CustomWindow: refactor use of ImageId::FromUInt32
* Dropdown: refactor use of ImageId::FromUInt32, ToUInt32
* Remove ImageId::FromUInt32
* Fix typo in mechanic status string ids
* Rewrite InventoryFormatItem to not use inline sprites any more
* Widget: replace ImageId::ToUInt32 with ImageId::GetIndex
* Remove ImageId::ToUInt32