Split item filtering into separate source file

[dedmen]

Addition onto #57
Merge current Master branch (would be better to do that into rework branch first)
Split the item indexing/filtering out into separate files, and fix the broken conditions introduced in #57

Actual changes in eab81cf

I compared item counts from before(non-broken master branch)/after to confirm they match

AuctionHouseBot:
5957 disabled items
Loaded 5 grey trade goods
Loaded 471 white trade goods
Loaded 58 green trade goods
Loaded 26 blue trade goods
Loaded 3 purple trade goods
Loaded 1 orange trade goods
Loaded 0 yellow trade goods
Loaded 1633 grey items
Loaded 2771 white items
Loaded 5520 green items
Loaded 1645 blue items
Loaded 809 purple items
Loaded 0 orange items
Loaded 1 yellow items

With Rogue items disabled (Because I modified the way disabled class items are filtered)

AuctionHouseBot:
5957 disabled items
Loaded 5 grey trade goods
Loaded 471 white trade goods
Loaded 58 green trade goods
Loaded 26 blue trade goods
Loaded 3 purple trade goods
Loaded 1 orange trade goods
Loaded 0 yellow trade goods
Loaded 1628 grey items
Loaded 2699 white items
Loaded 5520 green items
Loaded 1645 blue items
Loaded 807 purple items
Loaded 0 orange items
Loaded 1 yellow items

All still matches

[Helias]

thanks for your PR!
Build is failing, check the errors in the pipeline please

[dedmen]

Buildfail is actually something from rework branch
AuctionHouseBot.h:3:1: fatal error: '/*' within block comment [-Wcomment]

Also I put the wrong license header, trinitycore one instead of AC

[dedmen]

Are you okey with my file naming? The other files all prefix "AuctionHouseBot", but I don't think there is actually a technical reason to do that?
I would prefer shorter names, we already know this is AuctionHouseBot because it's in "mod-ah-bot/src" folder

[dedmen]

This is still waiting, any update?

I would like to make more contributions but its very hard to handle all the conflicts.

[Helias]

merged, thanks!