Make ToolbarWindow toggleable via command

[Fayti1703]

Baseline change as it says on the tin.

I've adjusted the GPose event listener to use bool while I was at it. If you want this as a separate PR (or merge just those early), tell me.

Open Issues:

• [ ] These changes are untested
• [ ] If the toolbar sub-command is executed outside of GPose, nothing currently happens. Unsure if we should just allow the toolbar window up regardless or display a warning to the user somehow. (I'd prefer the latter, but I don't know how to do that with Dalamud)