Replace Snow with Snowscape

[shrianshChari]

Resolves compatibility issues created by smogon/pokemon-showdown@deda1db

Alternatively, we can edit the fromshowdownmessage method to try and turn messages that are read in as "Snowscape" to also return Weather.SNOW, which would maintain compatibility with older builds of the Showdown server.

[hsahovic]

Thanks @shrianshChari ! I agree we could try keeping this backwards-compatible. I will merge this to fix the current situation, but If you want to follow up with the other change, I'll happily merge it as well.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.27%. Comparing base (f458350) to head (de93636).
Report is 131 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #709      +/-   ##
==========================================
+ Coverage   83.38%   84.27%   +0.88%     
==========================================
  Files          39       42       +3     
  Lines        3918     4432     +514     
==========================================
+ Hits         3267     3735     +468     
- Misses        651      697      +46     

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