Move InternalImageConverter to conversion package

Author: mwilliamson

src/main/java/org/zwobble/mammoth/internal/conversion/DocumentToHtml.java

@@ -1,6 +1,5 @@
 package org.zwobble.mammoth.internal.conversion;
 
-import org.zwobble.mammoth.internal.InternalImageConverter;
 import org.zwobble.mammoth.internal.documents.*;
 import org.zwobble.mammoth.internal.html.Html;
 import org.zwobble.mammoth.internal.html.HtmlNode;

src/main/java/org/zwobble/mammoth/internal/conversion/DocumentToHtmlOptions.java

@@ -1,7 +1,6 @@
 package org.zwobble.mammoth.internal.conversion;
 
 import org.zwobble.mammoth.images.ImageConverter;
-import org.zwobble.mammoth.internal.InternalImageConverter;
 import org.zwobble.mammoth.internal.styles.DefaultStyles;
 import org.zwobble.mammoth.internal.styles.StyleMap;
 import org.zwobble.mammoth.internal.styles.parsing.StyleMapParser;

src/main/java/org/zwobble/mammoth/internal/InternalImageConverter.java renamed to src/main/java/org/zwobble/mammoth/internal/conversion/InternalImageConverter.java

@@ -1,4 +1,4 @@
-package org.zwobble.mammoth.internal;
+package org.zwobble.mammoth.internal.conversion;
 
 import org.zwobble.mammoth.images.ImageConverter;
 import org.zwobble.mammoth.internal.documents.Image;