Improved CWL generation and code refactor

What's Changed

• Create codeql.yml by @vedran-kasalica in #71
• Update constraint formats and annotation labels by @vedran-kasalica in #72
• Introduce constraints APERunConfig tag & refactor by @vedran-kasalica in #73
• Update version by @vedran-kasalica in #74
• Update README.md by @vedran-kasalica in #76
• Fix build badge by @vedran-kasalica in #77
• CWL fixes and dependencies update by @vedran-kasalica in #78
• Create CITATION.cff by @vedran-kasalica in #81

Full Changelog: v2.1.5...v2.1.7