Make the plugin part crossplatform (#1527)

library/src/commonMain/kotlin/com/lagradost/cloudstream3/plugins/BasePlugin.kt

@@ -0,0 +1,77 @@
+package com.lagradost.cloudstream3.plugins
+
+import com.fasterxml.jackson.annotation.JsonProperty
+import com.lagradost.cloudstream3.APIHolder
+import com.lagradost.cloudstream3.MainAPI
+import com.lagradost.cloudstream3.utils.ExtractorApi
+import com.lagradost.api.Log
+import com.lagradost.cloudstream3.utils.extractorApis
+
+const val PLUGIN_TAG = "PluginInstance"
+
+abstract class BasePlugin {
+    /**
+     * Used to register providers instances of MainAPI
+     * @param element MainAPI provider you want to register
+     */
+    fun registerMainAPI(element: MainAPI) {
+        Log.i(PLUGIN_TAG, "Adding ${element.name} (${element.mainUrl}) MainAPI")
+        element.sourcePlugin = this.filename
+        // Race condition causing which would case duplicates if not for distinctBy
+        synchronized(APIHolder.allProviders) {
+            APIHolder.allProviders.add(element)
+        }
+        APIHolder.addPluginMapping(element)
+    }
+
+    /**
+     * Used to register extractor instances of ExtractorApi
+     * @param element ExtractorApi provider you want to register
+     */
+    fun registerExtractorAPI(element: ExtractorApi) {
+        Log.i(PLUGIN_TAG, "Adding ${element.name} (${element.mainUrl}) ExtractorApi")
+        element.sourcePlugin = this.filename
+        extractorApis.add(element)
+    }
+
+    /**
+     * Called when your Plugin is being unloaded
+     */
+    @Throws(Throwable::class)
+    open fun beforeUnload() {
+    }
+
+    /**
+     * Called when your Plugin is loaded
+     */
+    @Throws(Throwable::class)
+    open fun load() {
+    }
+
+    /** Full file path to the plugin. */
+    @Deprecated(
+        "Renamed to `filename` to follow conventions",
+        replaceWith = ReplaceWith("filename")
+    )
+    var __filename: String?
+        get() = filename
+        set(value) {
+            filename = value
+        }
+    var filename: String? = null
+
+
+    class Manifest {
+        @JsonProperty("name")
+        var name: String? = null
+
+        @JsonProperty("pluginClassName")
+        var pluginClassName: String? = null
+
+        @JsonProperty("version")
+        var version: Int? = null
+
+        @JsonProperty("requiresResources")
+        var requiresResources: Boolean = false
+    }
+}

library/src/commonMain/kotlin/com/lagradost/cloudstream3/plugins/CloudstreamPlugin.kt

@@ -0,0 +1,5 @@
+package com.lagradost.cloudstream3.plugins
+
+@Suppress("unused")
+@Target(AnnotationTarget.CLASS)
+annotation class CloudstreamPlugin