Add HTTP log channel, and make ACHIEVEMENTS a proper one.

Common/Net/HTTPRequest.cpp

@@ -10,6 +10,8 @@
 namespace http {
 
 Request::Request(RequestMethod method, const std::string &url, const std::string &name, bool *cancelled, ProgressBarMode mode) : method_(method), url_(url), name_(name), progress_(cancelled), progressBarMode_(mode) {
+	INFO_LOG(HTTP, "HTTP %s request: %s (%s)", RequestMethodToString(method), url.c_str(), name.c_str());
+
 	progress_.callback = [=](int64_t bytes, int64_t contentLength, bool done) {
 		std::string message;
 		if (!name_.empty()) {