Reduce memory allocations significantly

[Qendolin]

Reduced dynamic memory allocation in Hemisphere.add and other places by ~50 MB/s (~90%).

Improvements:

• Prevent allocating hundreds of new TagDelegates each update by using Identifier as map keys.
• Prevent allocating many new ConcurrentHashMap$Node each update by using replaceAll((block, count) -> 0) instead of clear()
• Replaced deprecated TagRegistry.block and TagRegistry.create with TagFactory
• Replaced atmosfera$environmentContexts.computeIfAbsent with one time map initialization

Using ConcurrentHashMapreplaceAll() instead of clear() will keep all created Nodes around forever, but I don't think that'll be an issue since there are very few and they need little memory.

I've tested this somewhat, blockTags do seem to work but maybe I am missing something since I am not sure why the code was using TagDelegates in the first place. Also I did not find any use of biomeTags so I could not test it.

[koelle25]

Does this fix/close #31 ?

[Qendolin]

No, but fixing that issue is very easy. I'll add some code to the issue.

[EGOIST1372]

any update for the fix for #31 ?