Oxalis-AS4 5.5.0 Release

• Bump Oxalis to 5.5 (OxalisCommunity/oxalis@v5.4.0...v5.5.0)
• Bump cxf to 3.5.5 fixing #198 and Dependabot alerts (https://github.com/OxalisCommunity/Oxalis-AS4/security/dependabot/1 and https://github.com/OxalisCommunity/Oxalis-AS4/security/dependabot/2)
• Bump wss4j to 2.4.1
• Bump Peppol specification to 1.1.0
• Add dependency for soap api and saaj impl to fix nullpointer error
• Excluded conflicting libraries

Full Changelog: v5.4.0...v5.5.0

NOTE: If you are using Oxalis 5.5.0/Oxalis-AS4 5.5.0 and you are compiling source on Java 8, then download attached "dummy.zip" and place it's content in \oxalis-5.5.0\oxalis-test\src\main\resources\dummy . This will fix certification expiration issue.