[Ohrrpgce] slice lookup codes

[James Paige]

I was thinking about slice lookup codes. They do pretty much just what I 
want them to do in an individual game, but they are pretty useless when 
you export a collection of slices from one game and import it into 
another game.

Slice names are stored in the slicelookup.txt lump, so they are 
game-specific.

When a slice collection is exported, I would like to save the name of 
the lookup code instead of the number. When a slice collection is imported, 
I could look for matching names, use the existing code if possible, or 
add new codes automatically if they don't exist.

Right now, saving and export are the same, and loading and 
importing are the same. If I make saving lookup codes as text a thing 
that only happens in export, it means a split code path. If I make all 
lookup codes saved as strings I am worried about possible undesired 
side-effects.

I suppose that saving could save BOTH the lookup code number and the 
lookup code name, and then only the loading/importing code would need to 
diverge... I also suppose that the divergence would actually be 
relatively clean and simple, so it might not be a problem at all.

I am just thinking out loud here, but if anybody has any thoughts on the 
subject, feel free to speak up :)

---
James