Look for unmaintained dependencies

[GuySartorelli]

We've recently found a few dependencies we have which aren't maintained.
Where possible, these should be replaced with well-maintained alternatives.

Notes

• NPM glob-to-regexp and silverstripe/react-injector have already been identified as out of date here
• cwp-watea-theme and cwp-starter-theme were also identified at the same time as being possibly included in npm/yarn, somehow. They should be removed.

Acceptance Criteria

• A reasonable attempt has been made to identify unmaintained javascript dependencies across kitchen sink
• A reasonable attempt has been made to identify unmaintained PHP dependencies across kitchen sink
• Recommendations are made for what to replace - and what to replace them with
• Follow-up cards are made to replace the replaceable unmaintained dependencies