Favorite functionality in inventory

[snipercup]

Requires #114

This PR adds a QoL feature to control favorite items in the inventory, much like in CDDA.

• By clicking on the cell below the favorite column, you can toggle the item as favorite
• Favorite items will have a * in the favorite column
• When clicking "transfer all" (the button with <<- in them), it will not drop the favorited items unless the inventory only contains favorited items
• If favorited items are in a container, they will still be picked up by the transfer all (->>) button
• You can also sort the favorite column, so you could simplify a manual selection using that.
• Disabled UI updates during item transfer for bulk operations in this instance.

I highlighted the relevant UI elements for this PR: