Mostly these are deprecations from the Spigot team which I believe
shouldn't be deprecated. For example, players refer to each other by
name, not UUID - so there will always be a need for player lookup by
name. Also the block IDs are a well-documented standard that everyone
understands, even if they're not very human-friendly. Plugins use those
IDs and data values to specify block types for example in config files.
As for the rest of the ignores, I either decided the warnings are just
noise based on the situation, or that I'm comfortable with the risks.
Possibly for the first time in 5 years of dev work on this plugin, I
just compiled without any warnings. :)
This means admins will have to do repair when players leave gaping holes
in the ground, but also means that having the wrong sea level set in
your config file will no longer create "random" islands in the sky.
Payoffs in better out of the box experience for custom worlds and fewer
instances of helping customers troubleshoot.
