Add required items for scan

To do this, after you drop into your level, check the BepInEx log to find the index for big pickup item(s) you want to add to the scan.

Then, put in the index to RequiredItemsIndices:

"RequiredItemsIndices": [
   1, 3, 4
]

Note that 0 does not correspond to any big pickup items.

Example setup result (on a scan that's not extraction scan):

Things to NOTE:

• Adding required items to CP_Bioscan_Core is pretty straightforward.
• It is possible to add required items only to one / several of child scan(s) of a cluster scan.
• Adding required items to CP_Cluster_Core will apply to all its child scans.
• Do NOT use ConcurrentCluster when you add required items to a cluster scan. It's kinda bugged.