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diff --git a/src/3rdparty/assimp/code/StringUtils.h b/src/3rdparty/assimp/code/StringUtils.h
deleted file mode 100644
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--- a/src/3rdparty/assimp/code/StringUtils.h
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@@ -1,110 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2017, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-copyright notice, this list of conditions and the
-following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the
-following disclaimer in the documentation and/or other
-materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-contributors may be used to endorse or promote products
-derived from this software without specific prior
-written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-#ifndef INCLUDED_AI_STRINGUTILS_H
-#define INCLUDED_AI_STRINGUTILS_H
-
-#include <sstream>
-#include <stdarg.h>
-#include <cstdlib>
-
-/// @fn ai_snprintf
-/// @brief The portable version of the function snprintf ( C99 standard ), which works on visual studio compilers 2013 and earlier.
-/// @param outBuf The buffer to write in
-/// @param size The buffer size
-/// @param format The format string
-/// @param ap The additional arguments.
-/// @return The number of written characters if the buffer size was big enough. If an encoding error occurs, a negative number is returned.
-#if defined(_MSC_VER) && _MSC_VER < 1900
-
- inline int c99_ai_vsnprintf(char *outBuf, size_t size, const char *format, va_list ap) {
- int count(-1);
- if (0 != size) {
- count = _vsnprintf_s(outBuf, size, _TRUNCATE, format, ap);
- }
- if (count == -1) {
- count = _vscprintf(format, ap);
- }
-
- return count;
- }
-
- inline int ai_snprintf(char *outBuf, size_t size, const char *format, ...) {
- int count;
- va_list ap;
-
- va_start(ap, format);
- count = c99_ai_vsnprintf(outBuf, size, format, ap);
- va_end(ap);
-
- return count;
- }
-
-#else
-# define ai_snprintf snprintf
-#endif
-
-template <typename T>
-inline
-std::string to_string( T value ) {
- std::ostringstream os;
- os << value;
- return os.str();
-}
-
-inline
-float ai_strtof( const char *begin, const char *end ) {
- if ( nullptr == begin ) {
- return 0.0f;
- }
- float val( 0.0f );
- if ( nullptr == end ) {
- val = static_cast< float >( ::atof( begin ) );
- } else {
- std::string::size_type len( end - begin );
- std::string token( begin, len );
- val = static_cast< float >( ::atof( token.c_str() ) );
- }
-
- return val;
-}
-
-#endif // INCLUDED_AI_STRINGUTILS_H
-