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This ^ , if you are using IntelliJ. Inside External Libraries you should see a file named like that or similar: forge-1.16.1-32.0.98-mapped_snapshot_20200723-1.16.1-recomp.jar. This is how mine looks because i am using the latest versions of forge, but if you are using 1.15 it should not look too different. Of course the numbers in your file name will match the version of forge you are using

minecraft-xl-core != minecraftxlcore

The only two ways I can think of is either use SkullTileEntity.setPlayerProfile() or call onBlockPlacedBy() and pass in a stack with the nbt data you want. Both of them basically do the same thing.

Advancements not loading? I'd think the advancements have some kind of data format error. The only thing I can think of is phrases I remember such as "each condition must have a unique name", or maybe "something which is supposed to be a list is not correct json" as maybe one item and a list of items might both be accepted, but are not the same thing implying missing [ and ] somewhere. Perhaps supply the advancements files link?

You are defining dependencies for a mod with id "examplemod" that does not exist. Also note that your mod id currently does not match between mods.toml and @Mod

There is an ongoing effort in creating a spreadsheet for 1.16 mappings. It is not complete, and will be eventually merged into the MMMS (Mod Mapping Management System, a replacement for MCPBot). Although the effort is not complete, and not all names in the spreadsheet have been verified (to not include Official mappings because of licensing poison), a snapshot of those verified names have been produced and now is being hosted by Forge. (For details, look through the #mcpconfig and #mms channels on Discord) Note that this is a manual upload of the mappings, the same as the first mapping. MCPBot will not recognize these names.