* Part 2 of eslint prefer-const

* Release notes

* Update

Depends on https://github.com/actualbudget/docs/pull/202.

This is the last PR with lots of renaming for `loot-core`!

Closes #764

Dismiss the update notification only after clicking "close" button

This implements a simple indicator showing the user if the currently
used version is outdated by utilising GitHub tags to track the latest
version.
Closes #463

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Co-authored-by: Jed Fox <git@jedfox.com>