License manga update and Manga Fox Title Update (#937)

* update mangafox parsing to read chapter title also if it exists.

* updated chapterImpl to force update chapters if chapter name changes.  This allows for chapter name changes from the source to update in app

* switched from : to - since other sites that already have title use - so it provides consistency across sources.

* fixed spacing for -

* fixes license status for manga fox
if manga is licensed no chapters will be shown.

* 1. changed equality in chapterImp back to just the url (removed scanlator, and name comparison)
2. Removed extra line of code assigning mangaFox title twice
3. Modified ChapterSourceSync for scanlator/title/url comparison.

* cleaned spaces, added comment, incorporated toChange code from other pull request

* throw exception instead of returning empty list when licensed

* space fix

app/src/main/java/eu/kanade/tachiyomi/util/ChapterSourceSync.kt

@@ -20,7 +20,7 @@ import java.util.*
 fun syncChaptersWithSource(db: DatabaseHelper,
                            rawSourceChapters: List<SChapter>,
                            manga: Manga,
-                           source: Source) : Pair<List<Chapter>, List<Chapter>> {
+                           source: Source): Pair<List<Chapter>, List<Chapter>> {
 
     if (rawSourceChapters.isEmpty()) {
         throw Exception("No chapters found")
@@ -121,4 +121,5 @@ fun syncChaptersWithSource(db: DatabaseHelper,
         db.fixChaptersSourceOrder(sourceChapters).executeAsBlocking()
     }
     return Pair(toAdd.subtract(readded).toList(), toDelete.subtract(readded).toList())
+
 }