Refactor Coins.cpp, coin data as a const map

[optout21]

Description

Refactor the generated Coins.cpp files, instead of independent methods with large switch statements, create a map with all coin data, and retrieve data from there.
Motivation: data is closer to the coins.json file. Solves in part #885 .

Testing instructions

Build, check src/Generated/Coins.cpp.

Unit tests.

Types of changes

• Minor internal refactor

Checklist

• Prefix PR title with [WIP] if necessary.
• Add tests to cover changes as needed.
• Update documentation as needed.
• If there is a related Issue, mention it in the description (e.g. 'Fixes Adopt Zilliqa to bech32 address format #444 ).

[codecov]

Codecov Report

Merging #900 into master will increase coverage by 0.02%.
The diff coverage is 97.26%.

@@            Coverage Diff             @@
##           master     #900      +/-   ##
==========================================
+ Coverage   92.42%   92.44%   +0.02%     
==========================================
  Files         417      418       +1     
  Lines       12056    12119      +63     
==========================================
+ Hits        11143    11204      +61     
- Misses        913      915       +2     

Impacted Files	Coverage Δ
src/Coin.cpp	98.58% <95.23%> (-1.42%)	⬇️
src/Coin.h	100.00% <100.00%> (ø)
src/DerivationPath.h	100.00% <100.00%> (ø)

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[optout21]

/azp run

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[optout21]

I'm afraid CI teawking is needed.