raw: Add class for extracting bytes into structures

Change-Id: I30364d9fc5a5f02ee27e6b8fd17f40226b44dcc4
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/subprojects/fmt.wrap b/subprojects/fmt.wrap
new file mode 100644
index 0000000..bd840f4
--- /dev/null
+++ b/subprojects/fmt.wrap
@@ -0,0 +1,3 @@
+[wrap-git]
+url = https://github.com/fmtlib/fmt
+revision = 6.2.1