EDN Reader (#477)

* EDN Reader

* Revert incorrect changes

* Removed

* Exclude

* Read character literals

* Lots of changes

* Support for tagged elements

* Fix some bugs

* Parse numbers

* Numeric tests

* More tessts

* Fix number tests

* Collection tests

* Changelog

Author: chrisrink10

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
  * Added node syntactic location (statement or expression) to Basilisp AST nodes emitted by the analyzer (#463)
  * Added `letfn` special form (#473)
  * Added `defn-`, `declare`, and `defonce` macros (#480)
+ * Added EDN reader in the `basilisp.edn` namespace (#477)
 
 ### Changed
  * Change the default user namespace to `basilisp.user` (#466)