Context Navigation

Changes between Initial Version and Version 1 of Ticket #45187, comment 2

initial	v1
5	5
6	6	I've uploaded [attachment:45187.diff] which converts it to individual `$script->add()` calls with their versions, and a very rough proof-of-concept PHP which updates the `script-loader.php` versions with that from `package.json`.
	7
	8	(Try to ignore the fact the dependancies are much more unreadable now, some whitespace and multi-line registration could fix that, i just took the shortcut for a POC)