[refactor] Moved Settings to TypeScript

Moved the UI binding to a separate file as there is still a circular
dependency with 'engine'. But every other file that depends on Settings
is no longer part of a larger dependency cycle.

src/engine.js

@@ -55,7 +55,8 @@ import {saveObject, loadGame}                   from "./SaveObject";
 import {loadAllRunningScripts, scriptEditorInit,
         updateScriptEditorContent}              from "./Script";
 import {AllServers, Server, initForeignServers} from "./Server";
-import {Settings, setSettingsLabels}            from "./Settings";
+import {Settings}                               from "./Settings";
+import {setSettingsLabels}                      from "./ui/setSettingsLabels";
 import {initSourceFiles, SourceFiles,
         PlayerOwnedSourceFile}                  from "./SourceFile";
 import {SpecialServerIps, initSpecialServerIps} from "./SpecialServerIps";