Vendor rawler 0.7.2 unmodified

The crate as crates.io publishes it, minus .cargo-ok, its Cargo.lock and
data/testdata (13 MB of sample files only its own tests read). Not yet
routed through [patch.crates-io]; the next commit is the patch.

third_party/rawler-0.7.2/src/formats/bmff/free.rs

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: MIT
+// Copyright 2020 Alfred Gutierrez
+// Copyright 2021 Daniel Vogelbacher <daniel@chaospixel.com>
+
+use super::{BoxHeader, FourCC, ReadBox, Result};
+use serde::Serialize;
+use std::io::{Read, Seek, SeekFrom};
+
+#[derive(Debug, Clone, PartialEq, Default, Serialize)]
+pub struct FreeBox {
+  pub header: BoxHeader,
+}
+
+impl FreeBox {
+  pub const TYP: FourCC = FourCC::with(['f', 'r', 'e', 'e']);
+}
+
+impl<R: Read + Seek> ReadBox<&mut R> for FreeBox {
+  fn read_box(reader: &mut R, header: BoxHeader) -> Result<Self> {
+    reader.seek(SeekFrom::Start(header.end_offset()))?;
+
+    Ok(Self { header })
+  }
+}