Add a way to manually clear the clipboard

[andy-b-84]

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Brief Summary

Hello,

Thank you for maintaining KeePass XC, this is a great tool.

Add a way to manually clear the clipboard.

Example

Adding a "clear clipboard" button, or allow to clear the clipboard when clicking on the timer in the lower-right corner, for example, would be cool, IMHO.

Context

I have configured it to erase copied values automatically, as the feature exists.
Now, if it was possible to clear the clipboard from the KeePass window (a bit like forcing the timer to hit 0), that would be great.

[droidmonkey]

Good idea!