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/tests/mod.rs

@@ -0,0 +1,10 @@
+#[cfg(feature = "samplecheck")]
+mod cameras;
+#[cfg(feature = "samplecheck")]
+mod common;
+#[cfg(feature = "samplecheck")]
+mod dng;
+#[cfg(feature = "samplecheck")]
+mod issues;
+#[cfg(feature = "samplecheck")]
+mod samples;