Add option to automatically split tall downloaded images (#7029)

* Auto split long images to improve performance of reader

* Auto split long images to improve performance of reader - fixed the sorting

* Improved performance of splitting by getting rid of 1 extra loop

* Cleaned up code and moved the functionality to work during the downloading process (unsure how this affects download speed)

* Replaced the import .* with the actual used imports

* Fixes for Bugs discovered during my testing

* Fixed last split missing bug.

* Reordered the download progress to be updated before splitting instead of after to reflect more meaningful progress of download

* Reverted last commit since it had no effect

* Improved progress tracking when a download is paused then resumed.

* Implemented the recommended changes to enhance the feature.

* Apply suggestions from code review

Co-authored-by: arkon <arkon@users.noreply.github.com>

* Update app/src/main/res/values/strings.xml

Co-authored-by: arkon <arkon@users.noreply.github.com>

Co-authored-by: arkon <arkon@users.noreply.github.com>

app/src/main/res/values/strings.xml

@@ -407,6 +407,8 @@
     <string name="pref_download_new">Download new chapters</string>
     <string name="pref_download_new_categories_details">Manga in excluded categories will not be downloaded even if they are also in included categories.</string>
     <string name="save_chapter_as_cbz">Save as CBZ archive</string>
+    <string name="split_tall_images">Auto split tall images</string>
+    <string name="split_tall_images_summary">Improves reader performance by splitting tall downloaded images.</string>
 
       <!-- Tracking section -->
     <string name="tracking_guide">Tracking guide</string>