Add Harmony

[fxfactorial]

Added Harmony to TrustWallet

[codecov]

Codecov Report

Merging #626 into master will increase coverage by 0.18%.
The diff coverage is 95.37%.

@@            Coverage Diff             @@
##           master     #626      +/-   ##
==========================================
+ Coverage   84.04%   84.22%   +0.18%     
==========================================
  Files         273      278       +5     
  Lines        6488     6594     +106     
==========================================
+ Hits         5453     5554     +101     
- Misses       1035     1040       +5

Impacted Files	Coverage Δ
src/Harmony/Signer.h	100% <100%> (ø)
src/Harmony/Transaction.h	100% <100%> (ø)
src/interface/TWHarmonySigner.cpp	100% <100%> (ø)
src/Harmony/Signer.cpp	100% <100%> (ø)
src/Coin.cpp	93.75% <66.66%> (-2.31%)	⬇️
src/Harmony/Address.cpp	89.28% <89.28%> (ø)
... and 1 more

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[hewigovens]

@fxfactorial left some comments, overall is not bad

[hewigovens]

created an issue for the address part: #635