Remove globals, change conditional compilation, doormat

src/emulator.cpp

@@ -429,7 +429,7 @@ void Emulator::pollHttpServer() {
 	if (httpServer.pendingAction) {
 		switch (httpServer.action) {
 			case HttpAction::Screenshot: {
-				screenshot(httpServerScreenshotPath);
+				screenshot(HttpServer::httpServerScreenshotPath);
 				break;
 			}
 			case HttpAction::PressKey: {

src/httpserver.cpp

@@ -1,3 +1,4 @@
+#ifdef PANDA3DS_ENABLE_HTTP_SERVER
 #include "httpserver.hpp"
 
 #include <vector>
@@ -97,4 +98,6 @@ void HttpServer::startHttpServer() {
 		server.listen("localhost", 1234);
 	});
 	http_thread.detach();
-}
+}
+
+#endif  // PANDA3DS_ENABLE_HTTP_SERVER