Normalize quotes in READMEs

CONTRIBUTING.md

@@ -35,5 +35,5 @@ that simply reformat existing code.
 ## Legalities
 
 New Tectonic code is licensed under the MIT License, and we assign its copyright
-to “the Tectonic Project”. Any code that you submit to Tectonic will be assumed
+to "the Tectonic Project". Any code that you submit to Tectonic will be assumed
 to be made available under these terms unless explicitly stated otherwise.

Cargo.toml

@@ -8,7 +8,7 @@ version = "0.0.0-dev.0" # assigned with cranko (see README)
 authors = ["Peter Williams <peter@newton.cx>"]
 description = """
 A modernized, complete, embeddable TeX/LaTeX engine. Tectonic is forked from the XeTeX
-extension to the classic “Web2C” implementation of TeX and uses the TeXLive distribution
+extension to the classic "Web2C" implementation of TeX and uses the TeXLive distribution
 of support files.
 """
 homepage = "https://tectonic-typesetting.github.io/"

README.md

@@ -13,8 +13,8 @@ engine, powered by [XeTeX](http://xetex.sourceforge.net/) and
 
 If you just want to compile TeX documents, you should probably **click through
 to [the main Tectonic website](https://tectonic-typesetting.github.io/)**. This
-page is primarily aimed at folks interested in how Tectonic works “under the
-hood.” If you want to build the [`tectonic`][crate] Rust crate, check out [its
+page is primarily aimed at folks interested in how Tectonic works "under the
+hood." If you want to build the [`tectonic`][crate] Rust crate, check out [its
 README](./CARGO_README.md).
 
 [crate]: https://crates.io/crates/tectonic
@@ -47,7 +47,7 @@ If you’re interested in Tectonic as a software tool, you might also want to ch
   [project](https://github.com/Mrmaxmeier/tectonic-on-arXiv) by
   [@Mrmaxmeier](https://github.com/Mrmaxmeier/)
 
-## The “reference sources”
+## The "reference sources"
 
 Much of the core code of Tectonic is derived from
 [XeTeX](http://xetex.sourceforge.net/), and we strive to track and maintain
@@ -58,7 +58,7 @@ XeTeX, but the expression of those changes in source form may well change
 greatly over time.
 
 In this repository, the Git submodule `reference_sources` links to the
-[“staging repository”](https://github.com/tectonic-typesetting/tectonic-staging)
+["staging repository"](https://github.com/tectonic-typesetting/tectonic-staging)
 that tracks the XeTeX source
 code that we use as a reference. In particular, the version of the reference
 code in the submodule is the most recent code whose semantics are *guaranteed*

crates/bridge_core/README.md

@@ -5,7 +5,7 @@
 This crate is part of [the Tectonic
 project](https://tectonic-typesetting.github.io/en-US/). It provides a C API to
 core I/O services provided by the Tectonic Rust code. This API is then consumed
-by the various C/C++ “engines” implementing the TeX software.
+by the various C/C++ "engines" implementing the TeX software.
 
 - [API documentation](https://docs.rs/tectonic_bridge_core/).
 - [Main Git repository](https://github.com/tectonic-typesetting/tectonic/).

crates/bridge_graphite2/README.md

@@ -4,7 +4,7 @@
 
 This crate is part of [the Tectonic
 project](https://tectonic-typesetting.github.io/en-US/). It exposes the *C* API
-of the [graphite2] “smart font” system within the Rust/Cargo build framework,
+of the [graphite2] "smart font" system within the Rust/Cargo build framework,
 **with no Rust bindings**. This is why it is not named `graphite2-sys`.
 
 [graphite2]: https://graphite.sil.org/
@@ -13,7 +13,7 @@ of the [graphite2] “smart font” system within the Rust/Cargo build framework
 - [Main Git repository](https://github.com/tectonic-typesetting/tectonic/).
 
 The intention is that eventually this crate will provide the option of
-“vendoring” the graphite2 library, so that the Tectonic C code can use the
+"vendoring" the graphite2 library, so that the Tectonic C code can use the
 library without it needing to be installed on the system. However, this has not
 yet been implemented.
 

crates/bridge_icu/README.md

@@ -25,8 +25,8 @@ approach. This package is distinctive because:
 [pkg-config]: https://www.freedesktop.org/wiki/Software/pkg-config/
 [vcpkg]: https://vcpkg.readthedocs.io/
 
-Ideally, though, one day this crate will be superseded by a true Rust “sys
-crate”.
+Ideally, though, one day this crate will be superseded by a true Rust "sys
+crate".
 
 If your project depends on this crate, Cargo will export for your build script
 an environment variable named `DEP_ICUUC_INCLUDE_PATH`, which will be a

crates/bundles/README.md

@@ -4,7 +4,7 @@
 
 This crate is part of [the Tectonic
 project](https://tectonic-typesetting.github.io/en-US/). It implements various
-Tectonic “bundles” that provide access to collections of TeX support files.
+Tectonic "bundles" that provide access to collections of TeX support files.
 
 - [API documentation](https://docs.rs/tectonic_bundles/).
 - [Main Git repository](https://github.com/tectonic-typesetting/tectonic/).

crates/geturl/README.md

@@ -23,7 +23,7 @@ This crate provides the following [Cargo features][features]:
 [curl]: https://docs.rs/curl/
 [reqwest]: https://docs.rs/reqwest/
 
-There is always a “null” backend available, which will always return errors. If
+There is always a "null" backend available, which will always return errors. If
 more than one backend is enabled, their prioritization is:
 
 - `reqwest` (most preferred)

crates/pdf_io/README.md

@@ -13,7 +13,7 @@ providing only a C API*.
 - [Main Git repository](https://github.com/tectonic-typesetting/tectonic/).
 
 This crate depends on [libpng], which it attempts to find externally using
-[pkg-config] or [vcpkg]. It should be possible to create another “bridge” crate
+[pkg-config] or [vcpkg]. It should be possible to create another "bridge" crate
 so that this external dependency could be avoided, but this hasn’t been done
 yet.