Adds a de-interlace module and stuff

Adds a module to de-interlace when converting a video. It's enabled by a new configuration option.
Fixes some bugs in the letterbox cropper
Adds mpeg4 to video formats

src/main/java/net/knarcraft/ffmpegconverter/utility/FFMpegHelper.java

@@ -184,8 +184,8 @@ public final class FFMpegHelper {
      * @param stream  <p>The stream to map</p>
      */
     public static void mapStream(@NotNull FFMpegCommand command, @NotNull StreamObject stream) {
-        command.addOutputFileOption("-map", String.format("%d:%d",
-                stream.getInputIndex(), stream.getAbsoluteIndex()));
+        command.addOutputFileOption("-map", String.format("%d:%d", stream.getInputIndex(),
+                stream.getAbsoluteIndex()));
     }
 
     /**