ANN: ClojureScript 1.9.473, bugfix release

[David Nolen]

ClojureScript, the Clojure compiler that emits JavaScript source code.

README and source code: https://github.com/clojure/clojurescript

Leiningen dependency information:

[org.clojure/clojurescript "1.9.473"]

This is a bugfix release.

As always, feedback welcome!

## Fixes

* CLJS-1931: Closure Compiler {{--generate_exports}} flag not supported

* CLJS-1934: Self-host: require-macros :reload / :reload-all fails

* CLJS-1932: Self-host: Perf regression macroexpand-check

* CLJS-1930: Master broken wrt static field: ES5_STRICT_UNCOMMON

* CLJS-1929: When expanding libs don't include Hidden files

* CLJS-1905: Self-host: Stacktraces for script/test-self-parity

* CLJS-1795: Support more options in the `:closure-warnings` compiler option

* CLJS-1922: Use :file as relative output path for foreign-libs

* CLJS-1831: Self-host: Improperly munge ns names

* CLJS-1925: Use of undeclared Var cljs.user/RegExp when extending protocol for RegExp

* CLJS-1920: cljs.build.api/node-inputs: package.json files are only added if module entries are top-leve

* CLJS-1916: __dirname and __filename are not defined when compiling for Node.js with optimizations :none

* CLJS-1915: cljs.test: Index out of bounds for stack element w/o line/column