把一些项目移动到插件中

Plugins/Store.ImageCache/appsettings.ImageCache.json

@@ -0,0 +1,5 @@
+{
+  "ImageCache": {
+    "ConnectionString": "Server=192.168.0.200;Port=3306;Database=ImageCache;Uid=root;Pwd=123456;Allow User Variables=true"
+  }
+}