Fix PMD and CheckStyle warnings.

Author: uhafner

plugin/src/main/java/io/jenkins/plugins/forensics/git/delta/DeltaRepositoryCallback.java

@@ -3,6 +3,7 @@
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
+import java.util.EnumMap;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -196,7 +197,8 @@ private FileChanges createFileChanges(final FileEditType fileEditType, final Dif
 
         diffFormatter.format(diffEntry);
 
-        FileChanges fileChanges = new FileChanges(filePath, oldFilePath, fileContent, fileEditType, new HashMap<>());
+        FileChanges fileChanges = new FileChanges(filePath, oldFilePath, fileContent, fileEditType,
+                new EnumMap<>(ChangeEditType.class));
 
         for (Edit edit : diffFormatter.toFileHeader(diffEntry).toEditList()) {
             createChange(edit).ifPresent(fileChanges::addChange);

plugin/src/main/java/io/jenkins/plugins/forensics/git/delta/package-info.java

@@ -1,10 +1,8 @@
 /**
  * Git implementation for determining the code difference - so called 'delta' - between two commits.
- *
- * @author Florian Orendi
  */
 @DefaultAnnotation(NonNull.class)
 package io.jenkins.plugins.forensics.git.delta;
 
 import edu.umd.cs.findbugs.annotations.DefaultAnnotation;
-import edu.umd.cs.findbugs.annotations.NonNull;
+import edu.umd.cs.findbugs.annotations.NonNull;

plugin/src/main/java/io/jenkins/plugins/forensics/git/miner/package-info.java

@@ -1,5 +1,6 @@
 /**
  * Provides API classes to obtain commit statistics for files in a repository.
+ *
  * <p>
  * For pull requests (or more generally: for jobs that have a reference build defined) the classes in this package
  * collect a statistical summary for all containing commits. This includes the commits count, the changed files count,
@@ -10,6 +11,7 @@
  * Additionally, the classes in this package will collect commit statistics for all repository files in the style of
  * the book "Code as a Crime Scene":
  * </p>
+ *
  * <ul>
  *     <li> commits count </li>
  *     <li> different authors count </li>

plugin/src/main/java/io/jenkins/plugins/forensics/git/reference/package-info.java

@@ -1,5 +1,6 @@
 /**
  *  Provides classes to discover reference builds in Git projects.
+ *
  * <p>
  * Several plugins that report build statistics (test results, code coverage, metrics, static analysis warnings)
  * typically show their reports in two different ways: either as absolute report (e.g., total number of tests or