Change project structure;

Added new c# binding;

native/external/assimp/commonMetaData.h

@@ -0,0 +1,69 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2025, 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.
+---------------------------------------------------------------------------
+*/
+
+/** @file commonMetaData.h
+ *  @brief Defines a set of common scene metadata keys.
+ */
+#pragma once
+#ifndef AI_COMMONMETADATA_H_INC
+#define AI_COMMONMETADATA_H_INC
+
+#ifdef __GNUC__
+#pragma GCC system_header
+#endif
+
+/// Scene metadata holding the name of the importer which loaded the source asset.
+/// This is always present if the scene was created from an imported asset.
+#define AI_METADATA_SOURCE_FORMAT "SourceAsset_Format"
+
+/// Scene metadata holding the version of the source asset as a string, if available.
+/// Not all formats add this metadata.
+#define AI_METADATA_SOURCE_FORMAT_VERSION "SourceAsset_FormatVersion"
+
+/// Scene metadata holding the name of the software which generated the source asset, if available.
+/// Not all formats add this metadata.
+#define AI_METADATA_SOURCE_GENERATOR "SourceAsset_Generator"
+
+/// Scene metadata holding the source asset copyright statement, if available.
+/// Not all formats add this metadata.
+#define AI_METADATA_SOURCE_COPYRIGHT "SourceAsset_Copyright"
+
+#endif