support directed strings

[fatadel]

In the playground, we had an issue regarding string direction assertions. The issue applies to ediTDor as well, since it "visualizes" the structure of a TD in the right pane. So, this PR fixes that problem.

A TD to test

``` { "id": "urn:simpleWithDefaults", "@context": [ "https://www.w3.org/2022/wot/td/v1.1", { "@language": "ar-EG", "@direction": "rtl" } ], "title": "hello.", "description": "شيء يقيس درجة الحرارة و يظهر حالته", "descriptions": { "ar": "desc." }, "securityDefinitions": { "basic_sc": { "scheme": "basic", "in": "header" } }, "security": [ "basic_sc" ], "properties": { "status": { "type": "string", "readOnly": true, "writeOnly": false, "observable": false, "forms": [ { "href": "https://mylamp.example.com/status", "op": "readproperty", "contentType": "application/json" } ] } }, "actions": { "toggle": { "safe": false, "idempotent": false, "forms": [ { "href": "https://mylamp.example.com/toggle", "op": "invokeaction", "contentType": "application/json" } ] } }, "events": { "overheating": { "data": { "type": "string", "readOnly": true, "writeOnly": false }, "forms": [ { "href": "https://mylamp.example.com/oh", "op": "subscribeevent", "subprotocol": "longpoll", "contentType": "application/json" } ] } } } ```

[fatadel]

@egekorkan should have mentioned this issue as well.

[egekorkan]

Also, this is a feature required for the TD 1.1 publication from internationalization point of view. CC @sebastiankb

[egekorkan]

I am sadly not able to test it but the changes in index.js and util.js are from playground and they work.