Check project ID when doing sync

When doing project pull/push, we should check project info based on project's ID instead of project name, to make sure that we're do the right thing even if something happened to the project:

• project got renamed (or project was transferred to other workspace and we still have access to it) - we sync as usual, using the new project name when doing upload/download API calls
• project was deleted - if project info returns 404, we know it got deleted
• project access permission was removed from our user - if project info returns 403, we know there's permission problem

Note: some projects created/updated with an old version of MM plugin will not have project ID stored in the metadata - it would be good if we could handle those correctly as well (just hope that the project was not renamed / transferred).

Once #190 is implemented, it should be possible to add auto tests that will exercise that check.

先追蹤專案的 pull/push 流程，以及專案中繼資料目前如何儲存專案名稱。檢視 project-info API 呼叫和 issue #190，接著新增對以 ID 為基礎的查找、重新命名或移轉處理、404 刪除，以及 403 權限錯誤的檢查，同時保留沒有 ID 的中繼資料之既有行為。完成時應包含 issue 中描述的自動化測試。