[Ethereum] Add amount to contract and fix data variable in case transfer

[hewigovens]

#1210 followup

• transfer and contract underlaying is same, separate cases allow user adding Transfer, Smart Contract Call easily on UI
• Fix transfer case wrong data variable
• some cleanup

[codecov]

Codecov Report

Merging #1223 (43f498c) into master (099bb4c) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1223      +/-   ##
==========================================
- Coverage   95.29%   95.28%   -0.02%     
==========================================
  Files         433      433              
  Lines       13123    13069      -54     
==========================================
- Hits        12506    12453      -53     
+ Misses        617      616       -1     

Impacted Files	Coverage Δ
src/Ethereum/Signer.cpp	99.06% <100.00%> (+0.03%)	⬆️
src/Ethereum/Transaction.h	100.00% <100.00%> (ø)
src/Bitcoin/CashAddress.cpp	82.22% <0.00%> (-2.40%)	⬇️
src/interface/TWStoredKey.cpp	91.57% <0.00%> (-1.06%)	⬇️
src/NEO/Witness.h	85.71% <0.00%> (-0.96%)	⬇️
src/NEO/Address.cpp	77.77% <0.00%> (-0.80%)	⬇️
src/NEO/ReadData.cpp	76.66% <0.00%> (-0.76%)	⬇️
src/Algorand/Address.cpp	87.09% <0.00%> (-0.41%)	⬇️
src/Stellar/Address.cpp	88.88% <0.00%> (-0.31%)	⬇️
src/Nimiq/Address.cpp	91.30% <0.00%> (-0.25%)	⬇️
... and 30 more

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[hewigovens]

codecov sometimes complains decrease coverage by 0.01%.

[leoneparise]

LGTM. Let's merge and release a new version before Christmas 🎉

[nelsonjeff]

Blockchile