Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

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+# addr2line
+
+[![](https://img.shields.io/crates/v/addr2line.svg)](https://crates.io/crates/addr2line)
+[![](https://img.shields.io/docsrs/addr2line.svg)](https://docs.rs/addr2line)
+[![Coverage Status](https://coveralls.io/repos/github/gimli-rs/addr2line/badge.svg?branch=master)](https://coveralls.io/github/gimli-rs/addr2line?branch=master)
+
+A cross-platform library for retrieving per-address debug information
+from files with DWARF debug information.
+
+`addr2line` uses [`gimli`](https://github.com/gimli-rs/gimli) to parse
+the debug information, and exposes an interface for finding
+the source file, line number, and wrapping function for instruction
+addresses within the target program. These lookups can either be
+performed programmatically through `Context::find_location` and
+`Context::find_frames`, or via the included example binary,
+`addr2line` (named and modelled after the equivalent utility from
+[GNU binutils](https://sourceware.org/binutils/docs/binutils/addr2line.html)).
+
+# Quickstart
+ - Add the [`addr2line` crate](https://crates.io/crates/addr2line) to your `Cargo.toml`
+ - Load the file and parse it with [`addr2line::object::read::File::parse`](https://docs.rs/object/*/object/read/struct.File.html#method.parse)
+ - Pass the parsed file to [`addr2line::Context::new` ](https://docs.rs/addr2line/*/addr2line/struct.Context.html#method.new)
+ - Use [`addr2line::Context::find_location`](https://docs.rs/addr2line/*/addr2line/struct.Context.html#method.find_location)
+   or [`addr2line::Context::find_frames`](https://docs.rs/addr2line/*/addr2line/struct.Context.html#method.find_frames)
+   to look up debug information for an address
+
+# Performance
+
+`addr2line` optimizes for speed over memory by caching parsed information.
+The DWARF information is parsed lazily where possible.
+
+The library aims to perform similarly to equivalent existing tools such
+as `addr2line` from binutils, `eu-addr2line` from elfutils, and
+`llvm-symbolize` from the llvm project, and in the past some benchmarking
+was done that indicates a comparable performance.
+
+## License
+
+Licensed under either of
+
+  * Apache License, Version 2.0 ([`LICENSE-APACHE`](./LICENSE-APACHE) or https://www.apache.org/licenses/LICENSE-2.0)
+  * MIT license ([`LICENSE-MIT`](./LICENSE-MIT) or https://opensource.org/licenses/MIT)
+
+at your option.
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.