HEAVY memory usage on the "updates" updater

[SEAPUNK]

no idea what's going on, but this will likely help mitigate it

TODO

• [ ] Use GetFilteredSkuList instead of GetFilteredInventoryItemList, for performance reasons; compile the list of SKUs, and use them to create a queue for the common update function.
• [x] Once that's done, make a common function to update the data.
• [ ] In the common function, have a debug + benchmark system, that lets you know what size the response is, and how long it took it to process
• [ ] Figure out why the item re-fetching is using up so much memory

[SEAPUNK]

4eba21f64c23a08aaf1863a631000fa063d033e6 fixes the memory usage, but adds another item to the TODO list.