Update newcoin script to auto include coin entry include and creation.

[optout21]

Description

In new coin templating script newcoin include to automatically add the needed lines to src/Coin.cpp: an include and an instance creation line. Fixes #886 .

Testing instructions

• Clean workspace
• Add new Dummy coin to coins.json
• run codegen/bin/newcoin dummy
• check resulting Coin.cpp, build, etc.

Types of changes

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 #891 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #891   +/-   ##
=======================================
  Coverage   92.41%   92.41%           
=======================================
  Files         417      417           
  Lines       12040    12040           
=======================================
  Hits        11127    11127           
  Misses        913      913

Impacted Files	Coverage Δ
src/Coin.cpp	100% <ø> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 587e10b...14e4401. Read the comment docs.