* master: (148 commits)
Update Importer.cpp
[-] Trace print removed.
[F] Get return "like true" when error occured.
[*] qt_assimp_viewer can be built with Qt4 or Qt5. [F] Working in doule precision.
[F] List of importers can be empty.
[F] More correct control by a mouse
[F] React on mouse pressing ig view only.
[F] One alignment for labels. [-] Unused checkbox.
[+] QtCreator temporary file.
[*] Refactoring of "draw axes" procedure. [-] Removed not working part of code for reloading textures. That do nothing, just show checkbox. As Yoda said: "Do. Or do not. There is no try."
[-] Function "GetExtension" always return lowercase string. Using uppercase extension in desc is not needed.
glTF/2.0: Pick scene zero as scene to recursively load if no "scene" property is specified.
Fix GenVertexNormals
[F] Wrong type in equation.
[F] Uninitialized variables.
Fix#1587 : add validation to LWS unit test
Fix#1970: stl with empty solid
Add test for issue 1970: STL with empty solid
Add mesh name to ValidateDataStructure log
Read and write the KHR_materials_unlit glTF/2.0 extension.
...
# Conflicts:
# CMakeLists.txt
# port/iOS/build.sh
Assimp was returning glTF/2.0 values as address modes instead of aiTextureMapModes.
Also modified text glTF/2.0 model's sampler uv address modes to mirror/clamp respectively, and tests for them in the unit test.
Remove mesh instead. This keeps one edge case open: nodes without mesh
references. They are kept as it is for now (they may stilol contain
transformations and child references).
A binary FBX file can have an header section `FBXHeaderVersion` which starts around the 70th byte.
Therefore, the token check for DXF file was hitting true because the `SearchFileHeaderForToken` is case insensitive.
We limit the scope of the token search to the first 32 bytes.
