gui: save and load PSBT

Pull Request #17509

State completed
Build time Total: 43 minutes
6 minutes for macOS
8 minutes for Windows
29 minutes for Linux
Platforms   
Start Date2020-03-02 15:44:24 UTC
Github#17509
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Author Sjors
Pull request head hashf48130c3
Build styleThis pull request was built on top of current master
Build Log HEAD~6f48130c33 [gui] load PSBT
93fd0c27f [gui] save PSBT to file
c71d85060 [gui] send dialog: split on_sendButton_clicked
1f886243e Merge #18224: Make AnalyzePSBT next role calculation simple, correct
54a7ef612 Merge #17399: validation: Templatize ValidationState instead of subclassing
715dbbe9e Merge #18229: random: drop unused MACH time headers