Do not recompute the diff type if possible

Computing the diff type is not expensive, but it's always a good thing
to avoid unnecessary work.

Author: ibbem

src/main/java/org/variantsync/diffdetective/diff/difftree/parse/MultiLineMacroParser.java

@@ -64,13 +64,13 @@ ParseResult consume(
                     if (beforeMLMacro != null) {
                         return ParseResult.ERROR(MLMACRO_WITHIN_MLMACRO, "Found definition of multiline macro within multiline macro at line " + line + "!");
                     }
-                    beforeMLMacro = new MultilineMacro(line, lineNo, beforeStack.peek(), afterStack.peek());
+                    beforeMLMacro = new MultilineMacro(line, diffType, lineNo, beforeStack.peek(), afterStack.peek());
                 }
                 if (!isRem) {
                     if (afterMLMacro != null) {
                         return ParseResult.ERROR(MLMACRO_WITHIN_MLMACRO, "Found definition of multiline macro within multiline macro at line " + line + "!");
                     }
-                    afterMLMacro = new MultilineMacro(line, lineNo, beforeStack.peek(), afterStack.peek());
+                    afterMLMacro = new MultilineMacro(line, diffType, lineNo, beforeStack.peek(), afterStack.peek());
                 }
             } else { // body
                 // ... otherwise, it is a line within a body of a multiline macro. Thus append it.

src/main/java/org/variantsync/diffdetective/diff/difftree/parse/MultilineMacro.java

@@ -16,17 +16,6 @@ public class MultilineMacro {
     DiffType diffType;
 
     public MultilineMacro(
-            final String header,
-            final DiffLineNumber startLine,
-            final DiffNode beforeParent,
-            final DiffNode afterParent) {
-        this(
-                header, DiffType.ofDiffLine(header),
-                startLine,
-                beforeParent, afterParent);
-    }
-
-    private MultilineMacro(
             final String line,
             final DiffType diffType,
             final DiffLineNumber startLine,