Update Agenda, background job worker from v1 to v2

[simison]

Agenda v2 was a complete rewrite to support promises instead of callbacks.

Agenda is run in the background worker to process jobs. Main app and the worker run separately in parallel with npm start.

v2 changelog: https://github.com/agenda/agenda/blob/master/History.md#200--2018-07-19

Rewrite needed mainly at:

• Worker entry script: https://github.com/Trustroots/trustroots/blob/15a8bcebee8286eca1591f950a120420b2e08dd3/config/lib/worker.js
• At bunch of modules/*/server/jobs/*.server.job.js -files

I'm not sure if we should wait for ES5 → ES6 migration before updating Agenda, because we could jump directly using async/await -format (that we don't support at the moment).

[mrkvon]

Do we already have an issue about the migration ES5 -> ES6+? It's been coming up on different occasions.

It will need a change in linter and some period in which it will be ok to write the code in ES 2017.

The ./eslintrc may need { "parserOptions": { "ecmaVersion": 8 } } for support of async/await syntax. I don't know how this will affect Angularjs code. By this action we'll also drop support for older versions of nodejs. I.e. prior to 9.11.2. If we target ES2018, ("ecmaVersion": 9), we'll need nodejs v10.3.0+

[simison]

@mrkvon opened one here to keep track of ES6 migration: #804

[github-actions]

This issue is marked as unloved because it has not had any activity for 180 days.

It doesn't mean it's not important, so please remove the unloved label if you like it, or add a comment saying what it means to you :) If this was a bug, maybe you can test to see if this is still an issue?

However, if you just leave it like this, I'll close it in 14 days to help keep your issues tidy!

Thanks!