Code refactoring

[ErwanGauduchon]

Proposed changes

Replace raw http calls with SonarQube Java API when the program is run from SonarQube UI (#231).
Update dependencies in pom.xml.
Update CI workflow with last SonarQube LTS.
Replace Travis CI badge in README.md with GitHub Action badge.
Fix a bug occurring in a specific case when generating the docx/md (#266).

Types of changes

What types of changes does your code introduce to this software?

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Issues closed by changes

• Close Use of SQ internal API instead of localhost #231
• Close cnesreport-plugin-options Enable DOCX generation, Enable MD generation not working #266

Checklist

• I have read the CONTRIBUTING doc
• I agree with the CODE OF CONDUCT
• Lint and unit tests pass locally with my changes
• SonarCloud and Travis CI tests pass with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

47.0% Coverage
2.1% Duplication

[Sancretor]

Seems OK for me, but I'd like to take some time to test it furthermore before we merge.