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Refactored how the threading worked. Before it just keept up splitting
the screen recursively for x number of times.
Felt like using recursion was unnecessary. It's now just done in a
loop instead. The user can control the behaviour by setting
`num_threads_width` and `num_threads_height` which will split the
image x number of times and run a thread for each.
Split up the rendering function for one that does scaling and one
that doesn't. I just don't want to deal with any kind of scaling when
actually rendering the image. The code shouldn't change much so
maintaining is going to be ok.
- Fixed scaling issues where black bars would appear if the subimage
size wasn't divisible by the scale.
- Cleaned up a bunch of arcs and other things that wasn't neccesary
any more.
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- Preview quality is crude but works good enough.
- Add scaling to render function. This helps to make the preview
faster because we can use the same result for several pixels.
- You can move around the camera a bit with wasd, super basic.
- Press R to start/stop rendering the scene.
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- Made the traits into supertraits so we don't have to mention Send and
Sync everywhere.
- Add methods for Vec3 that modifies the existing Vector. Can be used
to make less copies.
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- All data shared between threads are now Arcs since the data is
immutable.
- Remove tokio
- Rustified main
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- Created a trait for all geometry that has to implement a hit
function. Depending on if the ray hits or not it returns an option
with the color.
- Add support for multiple samples per pixel
Current issues:
- Using cooperative multitasking which isn't that
helpful in this situation since it's like running without async but
without overhead. Should switch to rayon.
- All data gets copied once per job. Will decide later what to
do (copy or put locks and share data between jobs).
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Creating a bunch of futures that when completed get the buffers copied
to the screen buffer updating the screen as it gets done.
It's a bit overkill to create a future per row but it can be changed
later.
Moved hsv_to_rgb to utils. Don't even think it will be needed later.
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