Ask to save unsaved changes on closing patch

Paarth Agarwalrequested to merge
Paarth/purr-data:save_edited_patch into emscripten

On clicking the close patch button of an edited patch a dialog box will appear asking if the user would like to save changes or not. Fixes #849, related MR !792.

Demo:

ubuntu__Running__-_Oracle_VM_VirtualBox_2022-02-27_19-58-31_Trim

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