Start working on a Downloader app and backing classes in LibGUI.

LibGUI is slowly becoming LibKitchensink but I'm okay with this for now.

Applications/Downloader/.gitignore

@@ -0,0 +1,3 @@
+*.o
+*.d
+Downloader

Applications/Downloader/Makefile

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+OBJS = \
+    main.o
+
+APP = Downloader
+
+STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation
+WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
+FLAVOR_FLAGS = -fno-exceptions -fno-rtti
+OPTIMIZATION_FLAGS = -Os
+INCLUDE_FLAGS = -I../../Servers -I../.. -I. -I../../LibC
+
+DEFINES = -DSERENITY -DSANITIZE_PTRS -DUSERLAND
+
+CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
+CXX = i686-pc-serenity-g++
+LD = i686-pc-serenity-g++
+AR = i686-pc-serenity-ar
+LDFLAGS = -L../../LibC -L../../LibGUI
+
+all: $(APP)
+
+$(APP): $(OBJS)
+	$(LD) -o $(APP) $(LDFLAGS) $(OBJS) -lgui -lc
+
+.cpp.o:
+	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
+
+-include $(OBJS:%.o=%.d)
+
+clean:
+	@echo "CLEAN"; rm -f $(APPS) $(OBJS) *.d
+

Applications/Downloader/main.cpp

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+#include <LibGUI/GApplication.h>
+#include <LibGUI/GHttpRequest.h>
+#include <LibGUI/GHttpResponse.h>
+#include <LibGUI/GNetworkJob.h>
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    GApplication app(argc, argv);
+
+    GHttpRequest request;
+    request.set_hostname("www.google.com");
+    request.set_path("/");
+
+    auto job = request.schedule();
+    job->on_finish = [&job] (bool success) {
+        if (!success) {
+            dbgprintf("on_finish: request failed :(\n");
+            return;
+        }
+        auto& response = static_cast<const GHttpResponse&>(*job->response());
+        printf("on_receive: code=%d\n", response.code());
+        printf("payload:\n");
+        printf("%s", response.payload().pointer());
+        printf("payload was %d bytes\n", response.payload().size());
+    };
+
+    printf("Entering main loop...\n");
+    return app.exec();
+}