CameraServer is needed for editor node

- Editor asks ClassDB for docs
 - ClassDB asks CameraFeed for default parameters
 - In CameraFeed's constructor, polls CameraServer

platform/server/os_server.cpp

@@ -88,6 +88,8 @@ Error OS_Server::initialize(const VideoMode &p_desired, int p_video_driver, int
 	visual_server = memnew(VisualServerRaster);
 	visual_server->init();
 
+	camera_server = memnew(CameraServer);
+
 	AudioDriverManager::initialize(p_audio_driver);
 
 	input = memnew(InputDefault);
@@ -117,6 +119,8 @@ void OS_Server::finalize() {
 
 	memdelete(input);
 
+	memdelete(camera_server);
+
 	memdelete(power_manager);
 
 	ResourceLoader::remove_resource_format_loader(resource_loader_dummy);

platform/server/os_server.h

@@ -74,6 +74,7 @@ class OS_Server : public OS_Unix {
 #endif
 
 	CrashHandler crash_handler;
+	CameraServer *camera_server;
 
 	int video_driver_index;