Move client-specific files to 'src/client' (#7902)

Update Android.mk
Remove 'src/client' from include_directories

src/client/clientobject.cpp

@@ -0,0 +1,66 @@
+/*
+Minetest
+Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "clientobject.h"
+#include "debug.h"
+#include "porting.h"
+
+/*
+	ClientActiveObject
+*/
+
+ClientActiveObject::ClientActiveObject(u16 id, Client *client,
+		ClientEnvironment *env):
+	ActiveObject(id),
+	m_client(client),
+	m_env(env)
+{
+}
+
+ClientActiveObject::~ClientActiveObject()
+{
+	removeFromScene(true);
+}
+
+ClientActiveObject* ClientActiveObject::create(ActiveObjectType type,
+		Client *client, ClientEnvironment *env)
+{
+	// Find factory function
+	auto n = m_types.find(type);
+	if (n == m_types.end()) {
+		// If factory is not found, just return.
+		warningstream << "ClientActiveObject: No factory for type="
+				<< (int)type << std::endl;
+		return NULL;
+	}
+
+	Factory f = n->second;
+	ClientActiveObject *object = (*f)(client, env);
+	return object;
+}
+
+void ClientActiveObject::registerType(u16 type, Factory f)
+{
+	auto n = m_types.find(type);
+	if (n != m_types.end())
+		return;
+	m_types[type] = f;
+}
+
+