Feat: ImageRequestInit (#979)

* add ImageRequestInit & fix Hako

* remove multisrc fetchFile

* remove plugins fetchFile

* update docs and template file

plugins/turkish/epiknovel.ts

@@ -159,9 +159,6 @@ class EpikNovel implements Plugin.PluginBase {
 
     return novels;
   }
-  fetchImage(url: string): Promise<string | undefined> {
-    return fetchFile(url);
-  }
 }
 
 export default new EpikNovel();

plugins/turkish/lshnovel.broken.ts

@@ -166,9 +166,6 @@ class LSHNovel implements Plugin.PluginBase {
 
     return novels;
   }
-  async fetchImage(url: string): Promise<string | undefined> {
-    return await fetchFile(url);
-  }
 
   filters = {
     order: {