Fmreader split (#5800)

* split fmreader

* convert Manhwa18Net to factory

* remove the extra source

* add back Manhwa18

* fix building

multisrc/overrides/fmreader/heroscan/src/HeroScan.kt

@@ -0,0 +1,20 @@
+package eu.kanade.tachiyomi.extension.en.heroscan
+
+import eu.kanade.tachiyomi.multisrc.fmreader.FMReader
+import okhttp3.OkHttpClient
+
+class HeroScan : FMReader("HeroScan", "https://heroscan.com", "en") {
+    override val client: OkHttpClient = super.client.newBuilder()
+            .addInterceptor { chain ->
+                val originalRequest = chain.request()
+                chain.proceed(originalRequest).let { response ->
+                    if (response.code() == 403 && originalRequest.url().host().contains("b-cdn")) {
+                        response.close()
+                        chain.proceed(originalRequest.newBuilder().removeHeader("Referer").addHeader("Referer", "https://isekaiscan.com").build())
+                    } else {
+                        response
+                    }
+                }
+            }
+            .build()
+}