Add printf crate to workspace

This adds a crate containing a new implementation of printf, ported from musl.

This has some advantages:

- locale support is direct instead of being "applied after".
- No dependencies on libc printf. No unsafe code at all.
- No more WideWrite - just uses std::fmt::Write.
- Rounding is handled directly in all cases, instead of relying on Rust and/or
  libc.
- No essential dependency on WString.
- Supports %n.
- Implementation is more likely to be correct since it's based on a widely used
  printf, instead of a low-traffic Rust crate.
- Significantly faster.

Cargo.lock

@@ -348,6 +348,14 @@ version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
 
+[[package]]
+name = "printf"
+version = "0.1.0"
+dependencies = [
+ "libc",
+ "widestring",
+]
+
 [[package]]
 name = "printf-compat"
 version = "0.1.1"
@@ -488,9 +496,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.61"
+version = "2.0.63"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c993ed8ccba56ae856363b1845da7266a7cb78e1d146c8a32d54b45a8b831fc9"
+checksum = "bf5be731623ca1a1fb7d8be6f261a3be6d3e2337b8a1f97be944d020c8fcb704"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -646,5 +654,5 @@ checksum = "15e934569e47891f7d9411f1a451d947a60e000ab3bd24fbb970f000387d1b3b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.61",
+ "syn 2.0.63",
 ]