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)

[chirpxiv]

Exception when entering GPose:

17:04:35.520 | ERR Exception during raise of "Void Draw()"
System.NullReferenceException: Object reference not set to an instance of an object.
   at Ktisis.Interface.Components.Toolbar.ToolbarActorsList.IsValidActor(Int64 target) in D:\Projects\ktisis\Ktisis\Ktisis\Interface\Components\Toolbar\ToolbarActorsList.cs:line 107
   at Ktisis.Interface.Components.Toolbar.ToolbarActorsList.<>c.<Draw>b__4_0(Int64 o) in D:\Projects\ktisis\Ktisis\Ktisis\Interface\Components\Toolbar\ToolbarActorsList.cs:line 32
   at System.Collections.Generic.List`1.RemoveAll(Predicate`1 match)
   at Ktisis.Interface.Components.Toolbar.ToolbarActorsList.Draw() in D:\Projects\ktisis\Ktisis\Ktisis\Interface\Components\Toolbar\ToolbarActorsList.cs:line 32
   at Ktisis.Interface.Windows.Toolbar.ToolbarWindow.Draw() in D:\Projects\ktisis\Ktisis\Ktisis\Interface\Windows\Toolbar\ToolbarWindow.cs:line 90
   at Ktisis.Interface.KtisisGui.Draw() in D:\Projects\ktisis\Ktisis\Ktisis\Interface\KtisisGui.cs:line 36
   at Dalamud.Utility.EventHandlerExtensions.HandleInvoke(Action act) in C:\goatsoft\companysecrets\dalamud\Utility\EventHandlerExtensions.cs:line 96
{ } [ Send ]

[Fayti1703]

That looks... unrelated? ToolbarActorsList is not touched by this PR at all. Only way I can explain that happening is if SavedObjects somehow got a null element in it, but that should happen without these changes too.

[Fayti1703]

Note to self: c36a46a / 77ff104 (that is, the ActorStateWatcher refactoring commits) have landed as 639a896 / 306474b on v0.3/ui-rework.