Improve ServerUtils and TPS resolving

What's Changed

• Update pom.xml by @TheProJeckt in #33
• Various improvements and changes by @Andre601 in #23
• add %server_build% and %server_version_build% (closes #29) by @iGabyTM in #35
• Try and fix the paper build. by @Andre601 in #37
• Improve ServerUtils and TPS resolving by @Andre601 in #38

New Contributors

• @TheProJeckt made their first contribution in #33
• @iGabyTM made their first contribution in #35

Full Changelog: https://github.com/PlaceholderAPI/Server-Expansion/commits/2.6.1