inv_ui: fix accumulated minor issues

[andrei8l]

Summary

None

Purpose of change

The inventory UI has accumulated a few smaller issues:

• you need to press ; twice to toggle category mode in the pickup menu
• save state is not respected in the pickup menu so you always start in hierarchy mode
• integrated armor and internal CBM containers are lumped into ITEMS WORN
• there is no indication of the current uimode and people don't realize they can change it
• held item stacks with identical worn item. Fixes Wielded item is displayed as worn, if wearing an identical item. #59124
• corpse-pocket contents (such as samples) are counted as contained items but not displayed anywhere
• collapsed empty items don't stack with uncollapsed empty item even though there's no visible difference

Describe the solution

• Fix categorization of map items based on current uimode
• Use one separate save state for the pickup menu, one for the inventory and trade UI, and a common one for every other UI based on inventory_selector
• Split integrated armor and CBM containers to new categories in the worn column (as requested by Fris0uman)
• Add a uimode hint
• Don't count contents of corpse pockets
• Ignore collapsed status for empty items

Describe alternatives you've considered

N/A

Testing

before

CBM container and mutation armor are mixed with items worn

Corpse of a mutant says it contains 4 items but only displays one

Items in the map column aren't categorized

after

CBM container and mutation armor are in separate categories

Corpse of a mutant says it contains only the visible items

Items in the map column respect ui mode - this is technically new behaviour but I believe people will welcome this change. I can try to preserve the old behaviour if needed.

Toggle ui mode back and forth in various inventory UIs and check that items are in the right column and category.
Close and reopen the various inventory UIs and confirm that the chosen state persists.
Save and reload and confirm that the state persists.

Additional context

N/A

[andrei8l]

I really want to get this in 0.G so please tell me if anything seems too risky so I can take it out or tone it down.

[andrei8l]

Thanks for merging!