Don't issue plugin reload warning for plugin-type: import

Fixes #5719

core/modules/wiki.js

@@ -1509,6 +1509,13 @@ exports.invokeUpgraders = function(titles,tiddlers) {
 
 // Determine whether a plugin by title is dynamically loadable
 exports.doesPluginRequireReload = function(title) {
+	var tiddler = this.getTiddler(title);
+	if(tiddler && tiddler.fields.type === "application/json" && tiddler.fields["plugin-type"]) {
+		if(tiddler.fields["plugin-type"] === "import") {
+			// The import plugin never requires reloading
+			return false;
+		}
+	}
 	return this.doesPluginInfoRequireReload(this.getPluginInfo(title) || this.getTiddlerDataCached(title));
 };