Add option to always delete temporary files on nanazip close

[soredake]

Right now, when you open a file from archive (text file for example) and then close nanazip this file will not be deleted from %temp% folder, which is bad.

How it works in 7zip/nanazip:

1. You open archive.
2. You open text file from archive.
3. You close archive without closing text editor.
4. File in %temp% directory is not deleted.

How it works in winrar/peazip:

1. You open archive.
2. You open text file from archive.
3. You close archive without closing text editor.
4. File in %temp% directory is deleted.

So, an option (that should be enabled by default for security and space reasons) for wiping temp files after archive close will be nice.

Related: https://sourceforge.net/p/sevenzip/bugs/1448/ https://sourceforge.net/p/sevenzip/discussion/45797/thread/e23a6931/

[soredake]

WinRar does this by default, and has settings for this:

[soredake]

PeaZip too correctly deletes temporary files at exit.