Avalanche support

[fforbeck]

Proposed Changes

Adds support for Avalanche Test (Fuji) and Main networks.

#516

[codecov]

Codecov Report

Merging #517 (cc8a3a2) into master (8cabbac) will not change coverage.
The diff coverage is n/a.

❗ Current head cc8a3a2 differs from pull request most recent head 484e6c4. Consider uploading reports for the commit 484e6c4 to get more accurate results

@@           Coverage Diff           @@
##           master     #517   +/-   ##
=======================================
  Coverage   82.31%   82.31%           
=======================================
  Files          53       53           
  Lines        1855     1855           
  Branches      431      431           
=======================================
  Hits         1527     1527           
  Misses        328      328           

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