style: formatting and coverage

[sleepdefic1t]

This PR is primarily concerned with fixing issues found in Codacy/Codefactor/Codecov/Google C++ Style Guide/etc.

This PR also merges #108 & #109 from master.

What kind of change does this PR introduce?

• Code style update

Does this PR introduce a breaking change?

• Yes
• No

Does this PR release a new version?

• Yes
• No

The PR fulfills these requirements:

• It's submitted to the develop branch, not the master branch
• All tests are passing
• New/updated tests are included

[codecov-io]

Codecov Report

Merging #111 into develop will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           develop   #111    +/-   ##
=======================================
  Coverage      100%   100%            
=======================================
  Files           15     16     +1     
  Lines          249    369   +120     
=======================================
+ Hits           249    369   +120

Impacted Files	Coverage Δ
src/include/cpp-client/http/http.h	100% <ø> (ø)	⬆️
src/include/cpp-client/api/abstract.h	100% <100%> (ø)	⬆️
src/include/cpp-client/host/host.h	100% <100%> (ø)
src/include/cpp-client/api/peers/peers.h	100% <100%> (ø)	⬆️
...include/cpp-client/api/transactions/transactions.h	100% <100%> (ø)	⬆️
...c/include/cpp-client/api/blockchain/blockchain.hpp	100% <100%> (ø)	⬆️
src/include/cpp-client/connection/connection.h	100% <100%> (ø)	⬆️
src/http/os/http.cpp	100% <100%> (ø)	⬆️
src/host/host.cpp	100% <100%> (ø)	⬆️
src/include/cpp-client/api/votes/votes.h	100% <100%> (ø)	⬆️
... and 7 more

---

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[sleepdefic1t]

Codacy isn't configured for tracking develop.
Current build can be seen here: codacy.com/project/sleepdefic1t/cpp-client.
The only issues are related to the changelog, but it's pretty much exactly what's at keepachangelog.com. Changelog would likely need ignored in Codacy settings.

Otherwise, coverage stays at 100%, updates are in place and tests are passing.

This should be good to go, @faustbrian .

[sleepdefic1t]

This one's good to go too, @faustbrian.
Please and thank you.

[faustbrian]

@sleepdefic1t conflicts

[sleepdefic1t]

@faustbrian
Codacy is still throwing a fit over CHANGELOG here.

This one's ready to go 👍