[FEATURE] Upload files to VT

[fl0ppy-d1sk]

Plugin(s)
VirusTotal

What's needed and why ?
We need to add new files on VT and wait for the results in case a file is not already uploaded. This will increase the security.

The setting SCAN_MODE could be used with the following values :

• hash : don't upload files to VT, only use hashes
• upload : upload files to VT if the file is not already present

The scan of a new file on VT can take some times so we need to display a "waiting page" for the user.