Drop AndroidX Webkit dependency

[CarlosOlivo]

Related to #96

Apparently the AndroidX WebKit dependency has compatibility problems with certain old versions of WebView and the jellyfin-web combo, although I can't find the origin/source/reason in the Logcat, at least the WebView versions >= 74 don't throw this exception.

I also notice a slight performance improvement when using just the WebViewClient, maybe it's my imagination.

Also, it will eventually be removed when the switch is made to the native client, who agrees?

• AVD settings
  Android 7.1.1 (API 25) x86_64
  WebView com.android.chrome version 69.0.3497.100 (code 349710067)

• With androidx.webkit.WebViewClientCompat (Version 1.4.0)
  

2021-02-09 11:49:38.500 10152-10152/org.jellyfin.mobile.debug E/RedScreenOfDeath: ══════════ Exception caught by Red Screen Of Death library ═════════
2021-02-09 11:49:38.500 10152-10152/org.jellyfin.mobile.debug E/RedScreenOfDeath: IllegalArgumentException
    java.lang.IllegalArgumentException: reasonPhrase can't be empty.
        at android.webkit.WebResourceResponse.setStatusCodeAndReasonPhrase(WebResourceResponse.java:138)
        at android.webkit.WebResourceResponse.<init>(WebResourceResponse.java:76)
        at xl.a(PG:292)
        at afG.handleMessage(PG:67)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6119)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
2021-02-09 11:49:38.500 10152-10152/org.jellyfin.mobile.debug E/RedScreenOfDeath: ════════════════════════════════════════════════════════════════════

• With android.webkit.WebViewClient
  

2021-02-10 00:15:21.085 7609-7609/org.jellyfin.mobile.debug E/WebViewFragment$initialize: Received WebView HTTP 400 error: null

Also closes #212

[nielsvanvelzen]

AndroidX is supposed to fix compatibility issues instead of causing them. This crash could be related to my recent dependency update (#293), it updated androidx.webkit from v1.3 to v1.4.

[CarlosOlivo]

AndroidX is supposed to fix compatibility issues instead of causing them. This crash could be related to my recent dependency update (#293), it updated androidx.webkit from v1.3 to v1.4.

Nop, still happens, you can test this with an Android Studio Emulator based on System Image Android 7.1.1 (API 25) x86_64 or equivalent. Or with any WebView < 70.

Or the other option is to force the user to update their WebView, although that I have not seen any other application do this.