Also document that ctrl-c doesn't restore the termcolor.
Fixes #347.

The --max-filesize option allows filtering files which are larger than
the specified limit. This is potentially useful if one is attempting to
search a number of large files without common file-types/suffixes.

See #369.

A maximum filesize can be specified as an argument to a `WalkBuilder`.
If a file exceeds the specified size it will be ignored as part of the
resulting file/directory set.

The filesize limit never applies to directories.

Fixes #391.

Fixes #383

This commit fixes two issues. The first issue is that if a file contained
many NUL bytes without any LF bytes, then the InputBuffer would read the
entire file into memory. This is not typically a problem, but if you run
rg on /proc, then bad things can happen when reading virtual memory mapping
files. Arguably, such files should be ignored, but we should also try to
avoid exhausting memory too. We fix this by pushing the `-a/--text` flag
option down into InputBuffer, so that it knows to stop immediately if it
finds a NUL byte.

The other issue this fixes is that binary detection is now applied to every
buffer instead of just the first one. This helps avoid detecting too many
files as plain text if the first parts of a binary file happen to contain
no NUL bytes. This issue still persists somewhat in the memory map
searcher, since we probably don't want to search the entire file upfront
for NUL bytes before actually performing our search. Instead, we search the
first 10KB for now.

Fixes #52, Fixes #311

When the --files flag is given, ripgrep would still try to parse some of
the positional arguments as regexes. Don't do that.

Fixes #326

@kbknapp <3

Fixes #327

All Windows specific code has been (mostly) pushed out of ripgrep and
into its constituent libraries.

This is essentially a rename of the existing `Stdout` type to `StandardStream`
and a change of its constructor from a single `new()` function to have two
`stdout()` and `stderr()` functions.

Under the hood, we add add internal IoStandardStream{,Lock} enums that allow
us to abstract between Stdout and Stderr conveniently. The rest of the needed
changes then fall out fairly naturally.

Fixes #324.

[breaking-change]

The documentation says:

> If `$XDG_CONFIG_HOME` is not set or is empty, then
> `$HOME/.config/git/ignore` is used instead.

This is the expected behavior, but the code looked at ~/git/ignore
instead.

.eex is the default file ending for templates using Elixir's template engine EEx.

It was missing a change about colors/styles.

Fixes #330

This removes all use of explicit unsafe in ripgrep proper except for
one: accessing the contents of a memory map. (Which may never go away.)