Prompt user before overwriting files

[ScrubN]

• This is how it looks in the CLI:

• This is not present in the regular WPF pages as the file explorer dialog provides a sufficient file overwrite prompt

• This is how it looks in the WPF task queue:

• Fixes #1081

• Fixes #997

• Fixes #968

• Fixes #266

• Fixes #236

• Closes #1034