Bump Dojo from 1.16.5 to 1.17.3.

This should help with some of the security findings.

lib/dojo/json5/README.md

@@ -0,0 +1,28 @@
+These modules are adapted from the [JSON5](https://github.com/json5/json5) project. JSON5 was adopted by
+the Dojo Toolkit for use by `dojo/parser` to facilitate parsing data attributes without using the unsafe
+JavaScript function `eval()`. As such only the parsing related modules from JSON5 are included.
+
+Updates from the JSON5 project can be incorporated into the Dojo Toolkit with the following process:
+
+* Clone the [JSON5 repository](https://github.com/json5/json5.git)
+* Convert the relevant files to ES5 syntax with TypeScript's compiler:
+```bash
+tsc lib/parse.js lib/unicode.js lib/util.js --allowJs --module ES6 --outDir dojo --removeComments --target ES5
+```
+* Visually compare the existing modules in `dojo/json5` with the newly converted modules to see what changes will need
+to be made
+* Copy the files from the `json5/dojo` folder to the `dojo/json5` folder
+* Manual updates:
+  * IMPORTANT: wrap the `lexStates` object property `default:` in quotes => `'default':`
+  * convert indentation to tabs in each module
+  * remove any trailing commas
+  * convert each module to AMD syntax
+* Update `json5/parse.js` to use `dojo/string` methods for ES5 String methods:
+  * require `'../string'` as `dstring`
+  * replace calls to `codePointAt` with `dstring.codePointAt(str, position)`
+  * replace calls to `String.fromCodePoint` with `dstring.fromCodePoint`
+* Run Dojo's JSON5 tests to ensure the updates were successful:
+  * `dojo/node_modules/intern-geezer/client.html?config=tests/dojo.intern&suites=tests/unit/json5`
+* Update the line below recording the most recent update
+
+Current as of 2020-06-12, commit [32bb2cd](https://github.com/json5/json5/commit/32bb2cdae4864b2ac80a6d9b4045efc4cc54f47a)