Implement WebView via Playwright (#1434)

* Implement Android's Looper

Looper handles thread messaging. This is used by extensions when they
want to enqueue actions e.g. for sleeping while WebView does someting

* Stub WebView

* Continue stubbing ViewGroup for WebView

* Implement WebView via Playwright

* Lint

* Implement request interception

Supports Yidan

* Support WebChromeClient

For Bokugen

* Fix onPageStarted

* Make Playwright configurable

* Subscribe to config changes

* Fix exposing of functions

* Support data urls

* Looper: Fix infinite sleep

* Looper: Avoid killing the loop on exception

Just log it and continue

* Pump playwright's message queue periodically

https://playwright.dev/java/docs/multithreading#pagewaitfortimeout-vs-threadsleep

* Update server/src/main/kotlin/suwayomi/tachidesk/graphql/types/SettingsType.kt

Co-authored-by: Mitchell Syer <Syer10@users.noreply.github.com>

* Stub a KCef WebViewProvider

* Initial Kcef Webview implementation

Still buggy, on the second call it just seems to fall over

* Format, restructure to create browser on load

This is much more consistent, before we would sometimes see errors from
about:blank, which block the actual page

* Implement some small useful properties

* Move inline objects to class

* Handle requests in Kcef

* Move Playwright implementation

* Document Playwright settings, fix deprecated warnings

* Inject default user agent from NetworkHelper

* Move playwright to libs.versions.toml

* Lint

* Fix missing imports after lint

* Update server/src/main/kotlin/suwayomi/tachidesk/server/ServerSetup.kt

Co-authored-by: Mitchell Syer <Syer10@users.noreply.github.com>

* Fix default user agent set/get

Use System.getProperty instead of SystemProperties.get

* Configurable WebView provider implementation

* Simplify Playwright settings init

* Minor cleanup and improvements

* Remove playwright WebView impl

* Document WebView for Linux

---------

Co-authored-by: Mitchell Syer <Syer10@users.noreply.github.com>

README.md

@@ -95,6 +95,25 @@ Download the latest `linux-x64`(x86_64) release from [the releases section](http
 
 `tar xvf` the downloaded file and double-click on one of the launcher scripts or run them using the terminal.
 
+#### WebView support
+
+WebView support is implemented via [KCEF](https://github.com/DATL4G/KCEF).
+This is optional, and is only necessary to support some extensions.
+
+To have a functional WebView, several dependencies are required; aside from X11 libraries necessary for rendering Chromium, some JNI bindings are necessary: gluegen and jogl (found in Ubuntu as `libgluegen2-jni` and `libjogl2-jni`).
+Note that on some systems (e.g. Ubuntu), the JNI libraries are not automatically found, see below.
+
+A KCEF server is launched on startup, which loads the X11 libraries.
+If those are missing, you should see "Could not load 'jcef' library".
+If so, use `ldd ~/.local/share/Tachidesk/bin/kcef/libjcef.so | grep not` to figure out which libraries are not found on your system.
+
+The JNI bindings are only loaded when a browser is actually launched.
+This is done by extensions that rely on WebView, not by Suwayomi itself.
+If there is a problem loading the JNI libraries, you should see a message indicating the library and the search path.
+This search path includes the current working directory, if you do not want to modify system directories.
+
+Refer to the [Dockerfile](https://github.com/Suwayomi/Suwayomi-Server-docker/blob/main/Dockerfile) for more details.
+
 ## Other methods of getting Suwayomi
 ### Docker
 Check our Official Docker release [Suwayomi Container](https://github.com/orgs/Suwayomi/packages/container/package/tachidesk) for running Suwayomi Server in a docker container. Source code for our container is available at [docker-tachidesk](https://github.com/Suwayomi/docker-tachidesk), an example compose file can also be found there. By default, the server will be running on http://localhost:4567 open this url in your browser.