Include the installed state in the template for toggling pause/stop

[kinow]

These changes close #748

Requirements check-list

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Appropriate tests are included (unit and/or functional).
• Appropriate change log entry included.
• No documentation update required.

[kinow]

Simply handling a new initial state that we have: installed. Here's the manual tests performed.

A installed, but never run, workflow:

A stopped workflow:

A running workflow:

A paused workflow (reloaded browser to confirm it's not only a local state):

A running (restart?) workflow:

Stopped again workflow:

[oliver-sanders]

We should really get rid of the installed state before release, putting up some PRs to address this...

[hjoliver]

(Presumably #805 makes this redundant?)

[hjoliver]

Sorry @kinow it looks like this one won't be needed now - OK?

[kinow]

Sorry @kinow it looks like this one won't be needed now - OK?

Yup! Not a problem, important thing is it was fixed :) closing now, thanks!

[hjoliver]

Oops, hang on, sorry! #748 is about greying out the play icons, not just the about-to-be-removed "installed" state. So maybe this PR could be adapted once installed is removed?

[hjoliver]

Luckily branch deletion is reversible 😁

[kinow]

Branch restored! 😌

[hjoliver]

Damn it, premature branch restoration!

I just ran the #805 branches and it looks like the icons are correctly greyed there for not-yet-run workflows.

[oliver-sanders]

I think #805 has now superseded this the lazy way (by deleting the extra state!).

[hjoliver]

OK you can delete your branch again @kinow 😁