Security Feature Request: Checksums. + Prevent overwrite of exported package lists.

Greetings!

It would be nice to have a checksum file available to verify the integrity of downloads. This file would contain SHA256 or other checksums of released packages. In addition, you could GPG sign the checksums but that could be considered excessive. Suggested as many security related packages do this.

Second, when exporting package lists UAD writes to a single file. This file is overwritten when I export a package list from "recommended" followed by one from "advanced" or another category. It would be nice if the app produced a separate exported package list whenever the user chooses to click "export".
E.g. UAD_exported_packages_1.txt, UAD_2.txt, UAD_3.txt ... and so on.

TubbyCat

尋找處理套件清單匯出和檔案寫入的程式碼。同時檢查發佈流程，以了解校驗和生成應放在何處。該 issue 提到了兩個獨立的功能：為下載生成校驗和以及防止匯出的套件清單被覆蓋。首先找到匯出函數並修改它以建立唯一的檔案名稱。對於校驗和，請研究建置/發佈腳本。

由索引模型根據 Issue 內容生成。