Convert gratss data to importable LOOT records on export

[rm-you]

When exporting to EQDKP, loot that was auctioned via NL will look like this on the export sheet:

[Sat Mar 26 21:57:29 2022] You say, 'LOOT: Item Name PlayerName #' (without the brackets)

If another NL user handled the loot, it will still be caught in the form of gratss messages, that look like this:

[Sat Mar 26 21:57:29 2022] Otheruser says, '~[Item Name] Gratss PlayerName (# DKP)!'

These should probably also be auto-converted on export to the same format as if they were a local auction, just on the off chance that they may need to be uploaded as part of the current attendance sheet.

[rm-you]

This would probably just need to be done here, before the message is written out to the creditt sheet: https://github.com/rm-you/ninjalooter/blob/master/ninjalooter/utils.py#L643-L644

Probably will want to make a new function in utils.py that takes a message line, tries to match it against the AWARD_MESSAGE_MATCHER, and if it matches, return a converted version instead. If it doesn't match, just return the original.

The only caveat here is that if people configured a custom award message, this will not work. I highly recommend people just leave the standard messages alone, if possible, for this reason.