[MangaThemesia] Option to hide paid chapters

[lord-ne]

Two of the sources using the MangaThemesiaAlt theme, NightScans and ThunderScans, have paid chapters which cannot be viewed in Mihon without purchasing (attempting to click them results in an error). This PR hides those chapters from the chapter list. It also adds a setting to go back to the old behavior of not hiding them (a user might want to use this, for example, to be notified when there are new paid chapters so that they can go and purchase them on the scanlator's website), but the default setting is to hide them.

Closes #5908

Checklist:

• N/A Updated extVersionCode value in build.gradle for individual extensions
• Updated overrideVersionCode or baseVersionCode as needed for all multisrc extensions
  • Updated overrideVersionCode for extensions that we added functionality to. The baseVersionCode does not need to be updated since we only added a new file to the multisource library, we didn't do anything that would affect existing extensions using the library.
• Referenced all related issues in the PR body (e.g. "Closes #xyz")
• N/A Added the isNsfw = true flag in build.gradle when appropriate
• Have not changed source names
• N/A Have explicitly kept the id if a source's name or language were changed
• Have tested the modifications by compiling and running the extension through Android Studio
• N/A Have removed web_hi_res_512.png when adding a new extension

The new setting option:

With hiding enabled:

With hiding disabled:

(Also confirmed that after logging in with web view and purchasing chapters, they do show up even if hiding is enabled)

[AwkwardPeak7]

I don't think this needs to be in MangaThemesiaAlt, maybe in the base class, but imo just update selector in affected sources.
afaik lock system isn't part of the base wordpress theme, it comes with some addon, so different sources can have different selectors

[lord-ne]

Two out of the three sources using the MangaThemesiaAlt base class (NightScans and ThunderScans) have this lock system, whereas none of the ones I checked using the regular MangaThemesia base class had it (I checked like 20), so I assumed it was related to the theme. Do you know what addon it comes from?

To be honest I still don't fully understand what MangaThemesiaAlt is, like why is there an Alt version? Is there a second version of the Manga theme on Themesia or something? We should really have documentation

[AwkwardPeak7]

Alt version have additional logic for dynamic urls (random part in manga url which changes every so often)

[lord-ne]

I see a few ways forward here, so I'm writing them out here to get your thoughts:

1. Manually implement this for Night Scans and Thunder Scans.
   a. This is simple, but we'd be duplicating a lot of code. It would get pretty annoying if any more sources needed this, we'd be copying the code everywhere.
2. Create some helper methods in the mangathemesia lib to help implement this
   a. Basically all the sources would have to do is call the helper methods inside their setupPreferenceScreen and chapterListSelector functions. But I'm not sure if creating helper methods like that is really something we do in this codebase.
3. Keep the functionality in the MangaThemesiaAlt class
   a. This is pretty simple. We should probably have a boolean to enable/disable it even if we do keep it here; we don't want the preference showing up for sources that actually don't need it.
4. Put the functionality in the MangaThemesia class
   a. This makes more sense conceptually than (3), but if it's tricky if we won't want the preference option to show up for sources that don't support it (which is most of them, so we probably do want to ensure it doesn't show up) because MangaThemesia doesn't currently have any preferences or inherit from ConfigurableSource, and we wouldn't want to have a blank preference screen show up.

I'm leaning towards (2), I'll throw together an implementation and see how it looks.

[lord-ne]

Updated and bench tested. How does this implementation look @AwkwardPeak7 ?

[AwkwardPeak7]

honestly just change selector in those sources to block paid chapters without any preference to toggle it.... that is what we usually do for most of such sources and only add preference if users ask for it.

[lord-ne]

I've actually been finding the toggle useful, some of these sites have decent coin rates where it's only like 10 cents per chapter, so on some of them I actually do want to leave the toggle off and buy the chapters.