Improve error formatting

[marc0246]

This PR mainly aims to address the issue that errors are not formatted nicely when using Result::unwrap or Result::expect.

The formatting now looks like this, using a random validation error:

called `Result::unwrap()` on an `Err` value: a validation error occurred

Caused by:
    `create_info.subpasses[0].view_mask`: is not `0`

Requires one of:
    The `multiview` feature

Vulkan VUIDs:
    VUID-VkSubpassDescription2-multiview-06558

I mainly took inspiration from anyhow for the formatting.

Runtime errors look like this:

called `Result::unwrap()` on an `Err` value: a runtime error occurred: a device memory allocation has failed

I also changed the existing Display implementation for RequiresOneOf a little, to make it clearer that e.g. you need of of the features, not all of the features.

It's important to note that old error types using RequiresOneOf are going to have a strange mix of the debug formattings until we replace them, so let's preferably do that soon. Not world-ending though.