Migrate DevSettings to PluginSettings for much better config flow (#572)

* Add the devsetting config options into settings

* Create dropdown component and add setting controls

* Static dropdwon width and spin arrow

* Improve dropdown option contrast and border

* Forgot to make the settings page respect the static spacing, oops

* Smaller arrow

* Vert padding

* Reset option for settings

* Hide reset button when on default

* Respect the logLevel setting

* Portal settings out to external typechecking module

* Implement new configs using the new singleton Settings

* Remove DevSettings

* Update test runner to use new settings

* More helpful test failure output

* Support non-plugin environment

* Migrate dropdown to new packages system

* Clean up components a tad

plugin/src/App/Components/IconButton.lua

@@ -30,6 +30,7 @@ function IconButton:render()
 		Position = self.props.position,
 		AnchorPoint = self.props.anchorPoint,
 
+		Visible = self.props.visible,
 		LayoutOrder = self.props.layoutOrder,
 		ZIndex = self.props.zIndex,
 		BackgroundTransparency = 1,