* AssimpViewer: Fix statistics reset + rename Time -> Loading time (more explicit)
* AssimpViewer: Fix bug where it was not possible to reload a closed asset
* AssimpViewer: Add a name in combobox for unnamed animations and disable anim UI when there is no animation
* AssimpViewer: Fixes the case where moving the anim cursor can break the animation
* AssimpViewer: Fixes the fact that when you press "play" on the animation after stopping it, there was a time jump in the animation
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Co-authored-by: Kim Kulling <kimkulling@users.noreply.github.com>