Add raw file type for Olympus and Nikon

This restriction was originally only there because a standalone --tree wasn’t a thing. Now it’s there, there’s no reason to forbid the combination.

This merges in exa’s own new options parser, which has the following features:

- You can specify an option twice and it’ll use the second one, making aliases usable for defaults (fixes #144)
- Lets arguments be specified more than once (fixes #125)

Strict mode is not done yet; I just wanted to merge this in because it’s been a while, and there’s work that needs to be done on master so I don’t want them drifting apart any further.

It’s likely that you’ll find cases where multiple arguments doesn’t work or where the wrong value is being used. There aren’t tests for *everything* yet, and it still uses global environment variables.

# Conflicts:
#	src/options/view.rs

Now I just need to remember to update it. Was suggested in #197.

The term_size crate introduced in #237 did things *slightly* differently than exa: it tried to get the terminal width of stdout, stderr, and stdin. This broke some tests that only redirected stdout.

Use term_size crate to fetch terminal size.

Update filetype.rs

Now it’s more like help. There aren’t any other fields in its struct at the moment, but there will be in the future (listing the features, and extremely colourful vanity mode)

Now, building the two result vectors doesn’t have to go through at least one field.

Originally, both the matched flags and the list of free strings were returned from the parsing function and then passed around to every type that had a ‘deduce’ method. This worked, but the list of free strings was carried around with it, never used.

Now, only the flags are passed around. They’re in a new struct which has the methods the Matches had.

Both of Matches’s fields are now just data, and all of the methods on MatchedFlags don’t ignore any fields, so it’s more cohesive, at least I think that’s the word.

Building up the MatchedFlags is a bit more annoying though because the vector is now hidden behind a field.

One of the previous tests started to fail, because it was working when it shouldn’t have! It worked up until now because I forgot to flag --level as taking an argument, and “--level 4” still worked with 4 as a filename. So there’s now an early check for that functionality that got lost somewhere.

Should be cross-platform, one step closer to Windows support.

Added a few video and audio extensions

Testing that a recent PR to rust-users (https://github.com/ogham/rust-users/issues/12) didn’t cause any regressions after updating to v0.5.3 of it.

Apparently I forgot to give the --time flag an argument, and this wasn’t actually covered by any of the xtests! Well, it’s tested now.

I’m not sure how to handle multiple --time arguments.

Fixes #193. --all was treated the same as --all --all; now it’s treated differently.

**

This commit removes the dependency on the ‘getopts’ crate entirely, and re-writes all its uses to use the new options parser instead.

As expected there are casualties galore:

- We now need to collect the options into a vector at the start, so we can use references to them, knowing they’ll be stored *somewhere*.
- Because OsString isn’t Display, its Debug impl gets used instead. (This is hopefully temporary)
- Options that take values (such as ‘sort’ or ‘time-style’) now parse those values with ‘to_string_lossy’. The ‘lossy’ part means “I’m at a loss for what to do here”
- Error messages got a lot worse, but “--tree --all --all” is now a special case of error rather than just another Misfire::Useless.
- Some tests had to be re-written to deal with the fact that the parser works with references.
- ParseError loses its lifetime and owns its contents, to avoid having to attach <'a> to Misfire.
- The parser now takes an iterator instead of a slice.
- OsStrings can’t be ‘match’ patterns, so the code devolves to using long Eq chains instead.
- Make a change to the xtest that assumed an input argument with invalid UTF-8 in was always an error to stderr, when that now in fact works!
- Fix a bug in Vagrant where ‘exa’ and ‘rexa’ didn’t properly escape filenames with spaces in.

This commit moves the definitions of Filter and DirAction from the options module to the fs module, but leaves the parts that actually have to do with option parsing alone.

Now, the options module shouldn’t define any types that get used elsewhere in the program: it only adds functionality to types that already exist.

Even though these can’t actually be viewed with `cargo doc` yet, they’re still good to have around.

Casualty here was that you can’t have static values reference one another directly, so the static args slice had to be turned into a slice *of references* rather than of values. No big deal, just have to write & a few more times.

Every time looking up an argument fails, it returns an error. We might as well just move this into the lookup function.