update assimp lib

Engine/lib/assimp/doc/Fileformats.md

@@ -12,9 +12,8 @@ __Importers__:
 - ASE
 - ASK
 - B3D
-- [BLEND](https://en.wikipedia.org/wiki/.blend_(file_format))
 - [BVH](https://en.wikipedia.org/wiki/Biovision_Hierarchy)
-- CMS
+- CSM
 - COB
 - [DAE/Collada](https://en.wikipedia.org/wiki/COLLADA)
 - [DXF](https://en.wikipedia.org/wiki/AutoCAD_DXF)
@@ -29,6 +28,7 @@ __Importers__:
   + KHR_texture_transform ( 5.1 under test )
 - HMB
 - IFC-STEP
+- IQM
 - IRR / IRRMESH
 - [LWO](https://en.wikipedia.org/wiki/LightWave_3D)
 - LWS
@@ -60,12 +60,16 @@ __Importers__:
 - [STL](https://en.wikipedia.org/wiki/STL_(file_format))
 - TER
 - UC
+- [USD](https://en.wikipedia.org/wiki/Universal_Scene_Description)
 - VTA
 - X
 - [X3D](https://en.wikipedia.org/wiki/X3D)
 - XGL
 - ZGL
 
+Note: support for [BLEND](https://en.wikipedia.org/wiki/.blend_(file_format)) is deprecated.
+It is too time-consuming to maintain an undocumented format which contains so much more than we need.
+
 Additionally, some formats are supported by dependency on non-free code or external SDKs (not built by default):
 
 - [C4D](https://en.wikipedia.org/wiki/Cinema_4D) (https://github.com/assimp/assimp/wiki/Cinema4D-&-Melange) IMporting geometry + node hierarchy are currently supported

Engine/lib/assimp/doc/dox.h

@@ -1545,7 +1545,7 @@ Don't trust the input data! Check all offsets!
 Mixed stuff for internal use by loaders, mostly documented (most of them are already included by <i>AssimpPCH.h</i>):
 <ul>
 <li><b>ByteSwapper</b> (<i>ByteSwapper.h</i>) - manual byte swapping stuff for binary loaders.</li>
-<li><b>StreamReader</b> (<i>StreamReader.h</i>) - safe, endianess-correct, binary reading.</li>
+<li><b>StreamReader</b> (<i>StreamReader.h</i>) - safe, endianness-correct, binary reading.</li>
 <li><b>IrrXML</b> (<i>irrXMLWrapper.h</i>)  - for XML-parsing (SAX.</li>
 <li><b>CommentRemover</b> (<i>RemoveComments.h</i>) - remove single-line and multi-line comments from a text file.</li>
 <li>fast_atof, strtoul10, strtoul16, SkipSpaceAndLineEnd, SkipToNextToken .. large family of low-level