Network cleanup (#6302)

* Cleanup network headers

* Move peerhandler to a specific header to reduce compilation times
* Move socket.cpp/h to network folder

* More work

* Network code cleanups

* Move socket.{cpp,h} to network folder
* Move Address object to network/address.{cpp,h}
* Move network exceptions to network/networkexceptions.h
* Client: use unique_ptr for Connection
* Server/ClientIface: use shared_ptr for Connection

* Format fixes

* Remove socket.cpp socket.h from clang-format whitelist

* Also fix NetworkPacket code style & make it under clang-format

src/network/networkexceptions.h

@@ -0,0 +1,106 @@
+/*
+Minetest
+Copyright (C) 2013-2017 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.
+*/
+
+#pragma once
+
+#include "exceptions.h"
+
+namespace con
+{
+/*
+	Exceptions
+*/
+class NotFoundException : public BaseException
+{
+public:
+	NotFoundException(const char *s) : BaseException(s) {}
+};
+
+class PeerNotFoundException : public BaseException
+{
+public:
+	PeerNotFoundException(const char *s) : BaseException(s) {}
+};
+
+class ConnectionException : public BaseException
+{
+public:
+	ConnectionException(const char *s) : BaseException(s) {}
+};
+
+class ConnectionBindFailed : public BaseException
+{
+public:
+	ConnectionBindFailed(const char *s) : BaseException(s) {}
+};
+
+class InvalidIncomingDataException : public BaseException
+{
+public:
+	InvalidIncomingDataException(const char *s) : BaseException(s) {}
+};
+
+class InvalidOutgoingDataException : public BaseException
+{
+public:
+	InvalidOutgoingDataException(const char *s) : BaseException(s) {}
+};
+
+class NoIncomingDataException : public BaseException
+{
+public:
+	NoIncomingDataException(const char *s) : BaseException(s) {}
+};
+
+class ProcessedSilentlyException : public BaseException
+{
+public:
+	ProcessedSilentlyException(const char *s) : BaseException(s) {}
+};
+
+class ProcessedQueued : public BaseException
+{
+public:
+	ProcessedQueued(const char *s) : BaseException(s) {}
+};
+
+class IncomingDataCorruption : public BaseException
+{
+public:
+	IncomingDataCorruption(const char *s) : BaseException(s) {}
+};
+}
+
+class SocketException : public BaseException
+{
+public:
+	SocketException(const std::string &s) : BaseException(s) {}
+};
+
+class ResolveError : public BaseException
+{
+public:
+	ResolveError(const std::string &s) : BaseException(s) {}
+};
+
+class SendFailedException : public BaseException
+{
+public:
+	SendFailedException(const std::string &s) : BaseException(s) {}
+};