The view menu contains:
1. A fullscreen option (also accessed by pressing F11).
2. Rotation axis controls (x, y, z, or any combination)
3. Rotation speed controls (No rotation, slow, normal, or fast)
Models that contain UV co-ordinates are now supported,
and will display with a texture wrapped around it, provided
a `bmp` with the same name as the object is in the same
directory as the 3D Model.
This unifies how 3DFileViewer handles the initial file when starting
the application and when opening files later on via the menu.
Errors are shown both for the initial load as well as when loading
files later on. An error during file load no longer clears the
existing model.
It also adds support for specifying the filename as a command-line
argument.
The opened file's name is shown in the titlebar.
An application that allows opening arbitrary files from the filesystem
needs to allow itself to access the filesystem, otherwise there's no
point in supporting the feature. :^)
And the "thread" pledge is needed for background thumbnail generation.
