Export trade hashes for mod stats

[vaisest]

Fixes nothing. This is not necessarily required for anything currently, and is mostly informative

Description of the problem being solved:

Adds trade hash exports to mod exports, and refactor mods.lua. The latter mostly motivated by LuaJIT issues where loading modules which contain very large tables crashes the program. Data files are now split into much more specific categories, and are combined at runtime to data.itemMods.Item.

Steps taken to verify a working solution:

• Manually checked quite a few random mods from multiple categories. They seem to be correct, and don't overlap with other files for no reason (e.g. ModExplicit doesn't have delve mods).
• Ran tests
• Regenerated modcache and verified there are no changes

Exported mods now have a field tradeHashes which is a table that maps from a trade hash to the matched modline for each stat. Note that there can be multiple of these, if a mod has multiple stats (i.e. lines) to it.

I wasn't able to find incorrect hashes, except for uul-netol's attack bleed chance. It doesn't really make sense since it's a single stat mod. Not sure what is going on there.

Outside of that everything seemed correct, except for obvious ones like timeless jewel mods (they have a special pseudo stat key).