Add GDB target IO support (called Host I/O by gdb), not working yet

sysmodules/rosalina/include/gdb/net.h

@@ -33,6 +33,7 @@
 u8 GDB_ComputeChecksum(const char *packetData, u32 len);
 void GDB_EncodeHex(char *dst, const void *src, u32 len);
 u32 GDB_DecodeHex(void *dst, const char *src, u32 len);
+u32 GDB_EscapeBinaryData(void *dst, const void *src, u32 len, u32 maxLen);
 u32 GDB_UnescapeBinaryData(void *dst, const void *src, u32 len);
 const char *GDB_ParseIntegerList(u32 *dst, const char *src, u32 nb, char sep, char lastSep, u32 base, bool allowPrefix);
 const char *GDB_ParseHexIntegerList(u32 *dst, const char *src, u32 nb, char lastSep);

sysmodules/rosalina/include/gdb/tio.h

@@ -0,0 +1,31 @@
+/*
+*   This file is part of Luma3DS
+*   Copyright (C) 2016-2019 Aurora Wright, TuxSH
+*
+*   This program is free software: you can redistribute it and/or modify
+*   it under the terms of the GNU General Public License as published by
+*   the Free Software Foundation, either version 3 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 General Public License for more details.
+*
+*   You should have received a copy of the GNU General Public License
+*   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+*   Additional Terms 7.b and 7.c of GPLv3 apply to this file:
+*       * Requiring preservation of specified reasonable legal notices or
+*         author attributions in that material or in the Appropriate Legal
+*         Notices displayed by works containing it.
+*       * Prohibiting misrepresentation of the origin of that material,
+*         or requiring that modified versions of such material be marked in
+*         reasonable ways as different from the original version.
+*/
+
+#pragma once
+
+#include "gdb.h"
+
+GDB_DECLARE_VERBOSE_HANDLER(File);