Rebase from upstream, begin applying renames
Add debian folder, apply patches permanently, fix build
Redirect imports.gi.GMenu to imports.gi.CMenu.

ref:
https://github.com/linuxmint/cjs/commit/d3ca0bd378dfc17e776991
Don't cache extension-local imports (extension-supplied .js files).

ref:
https://github.com/linuxmint/cjs/commit/2a511965b322b606acefd711
Fix prematurely freed string