Expose two-way sync.

- Convert plugin DevSettings flag to settings panel feature
- Remove server feature, always enable write API

plugin/src/Components/PluginSettings.lua

@@ -8,6 +8,7 @@ local Roact = require(Rojo.Roact)
 
 local defaultSettings = {
 	openScriptsExternally = false,
+	twoWaySync = false,
 }
 
 local Settings = {}