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/resources/conf/config.properties

@@ -15,4 +15,6 @@ audio-languages-anime=jpn,eng,*
 # The preference for subtitle languages when converting anime (0 = undefined, * = any)
 subtitle-languages-anime=eng,*
 # The preference for minimal subtitles, AKA Signs & Songs (REQUIRE/PREFER/NO_PREFERENCE/AVOID/REJECT)
-minimal-subtitle-preference=AVOID
+minimal-subtitle-preference=AVOID
+# The preference for whether video streams should be de-interlaced. It is recommended to only enable this when you notice that a video file is interlaced.
+de-interlace-video=false

src/main/resources/video_formats.txt

@@ -28,4 +28,5 @@ m2v
 svi
 3g2
 roq
-nsv
+nsv
+mpeg4