CodePaster: Add setting for expiry.

Add a setting for expiry in days and additional setting for
PasteView dialog which can be used to override.

Change-Id: Ie45e26b5cefd8f468d2f5c47df148cce582b201e
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/cpaster/fileshareprotocol.cpp

@@ -181,7 +181,7 @@ void FileShareProtocol::list()
 }
 
 void FileShareProtocol::paste(const QString &text,
-                              ContentType /* ct */,
+                              ContentType /* ct */, int /* expiryDays */,
                               const QString &username,
                               const QString & /* comment */,
                               const QString &description)