Improve verion, ZIP-archive and manifest checks

• Improves the compatability checks for a given Minecraft and Fabric/Quilt version
• Forwards erroneous configurations for versions to the frontend via the encounteredErrors list
• Check a given ZIP-archive for validity
• Improve the acquisition and checks of files and directories in a ZIP-archive
• Scan a manifest from ATLauncher and acquire versions from it
• Catch Quilt from various launcher manifests when possible

backend/main/java/de/griefed/serverpackcreator/spring/serverpack/ServerPackController.java

@@ -20,8 +20,6 @@
 package de.griefed.serverpackcreator.spring.serverpack;
 
 import java.util.List;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.core.io.Resource;
 import org.springframework.http.ResponseEntity;