Scripting: Add a console

https://api.github.com/acenturyandabit/workflowish/blob/59d27e5432f66790329e2aec60c56a985a2735a4/docs/roadmap.md#L7

```markdown

# Verison 3.4.1
`More useful search and jumping`
- [ ] TODO: Bug where CTRL+J won't work on collapsed items

# Version 3.4.2
`Scripting engine upgrades`
- [ ] TODO: Scripting: Add a console
- [ ] TODO: Move Workflowy global out of scripting engine
- [ ] TODO: Allow scripting engine to arbitrarily delete items
- [ ] TODO: Automate build numbers

# Version 3.5.1
`Extract Polycore as a design system`
- [ ] TODO: Frontend version pinning for stability
I want to use the underlying save system with another project.

# Version 3.5.2
- [ ] TODO: Better password entry dialog
- [ ] TODO: Upgrade README screenshot to gif
- [ ] TODO: Check up on feature documentation

```