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/converter/WebAnimeConverter.java

@@ -76,7 +76,7 @@ public class WebAnimeConverter extends AbstractConverter {
         FFMpegCommand command = FFMpegHelper.getFFMpegWebVideoCommand(executable, probeResult.parsedFiles());
         List<ConverterModule> modules = new ArrayList<>();
         if (this.debug) {
-            modules.add(new DebugModule(0, 0));
+            modules.add(new DebugModule());
         }
 
         //Get the first audio stream in accordance with chosen languages