Cleanup CMakeLists for unit tests, drop unneeded Windows dependency.
Add StreamWriter utility (mostly symmetric to StreamReader).
assimp_view: fix crash when trying to export while no model is loaded.
Extend StreamWriter to write to a buffer and to allow re-positioning of the write cursor within the buffer.
Initial implementation of 3DS Exporter. Hierarchy exporting and smoothing groups missing.
Fix CI build.
3DS Export: fix texture export.
3DS Exporter: export scene hierarchy.
Merge pull request #317 from assimp/export-3ds

3DS Exporter