Fix plugin and request.hpp bugs, add icon res file to Windows

src/plugin.cpp

@@ -218,7 +218,7 @@ static void pluginRefreshPlugin(json_t *pluginJ) {
 	// Find slug in plugins list
 	for (Plugin *p : gPlugins) {
 		if (p->slug == slug) {
-			// return;
+			return;
 		}
 	}
 

src/util/request.cpp

@@ -123,7 +123,9 @@ bool requestDownload(std::string url, std::string filename, float *progress) {
 	if (!curl)
 		return false;
 
-	FILE *file = fopen(filename.c_str(), "w");
+	FILE *file = fopen(filename.c_str(), "wb");
+	if (!file)
+		return false;
 
 	curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
 	curl_easy_setopt(curl, CURLOPT_VERBOSE, false);