Update dependencies

This adds support for the setuid, setgid, and sticky bits like how ls does it: by replacing the user/group/execute bits with different flags depending on their presence. At least we do it with flair, and by flair, I mean purple.

Fixes #142

Finally, re-do the permissions extended tests to include the setuid, setgid, and sticky bits, and rename the last two existing ones to match the others (files with the same names as their permissions).

Unlike the others, setuid/setgid/sticky get merged with user/group/other execute in the rendered Permissions cell. So there had to be a bit of code change done to make sure that none of the bits clashed.

The problem here was that we were using `metadata.permissions().mode()`, which is capped at 0o777, rather than `metadata.mode()`, which exposes every bit. With this change, we can access the higher-order permission bits, and put them in the Permissions struct.

…for its own module.

On the plus side, this removes some imports from details, and makes the file shorter. On the minus side, the ‘render timestamp’ function has a hell of a signature.

The three pieces of information for the leftmost details view column (file type, permissions, and whether xattrs are present) used to be gathered from separate sources and passed around separately before being displayed at the end. Now, file type and permissions are put into a struct, along with the xattrs boolean that’s still getting passed around all over the place but not quite as much.

This was all done because I wanted to be able to test permissions rendering, without having file type and xattrs dragged into the same function.

This is so we can define a render method on it.

A field can now render itself using colours and a users reference, rather than a Table doing the rendering. This way, only the relevant fields in the Environment can be made available to the render function, and the test code loses some lines.

The details file was getting quite long, so it’s probably time to split it up

Override the size column for block and charater devices, so it shows the major and minor device IDs instead (which are in the Metadata struct somewhere).

This is what ls does when faced with a device.

By parsing OsStrings rather than Strings, it’s the getopts crate that’s doing the UTF-8 checking rather than us, so if one of them isn’t valid, it’ll just fail to parse rather than crash exa.

Also, save a few allocations here and there.

Remove lazy_static crate

It's not being used anymore.