Add more details to a highscore summary

[Mikolaj]

E.g., the add % of valuables collected, which is easy to derive from game over screens (and, while still playing, from the total team belongings menu), Own/enemy hp lost/healed. Percent of whole dungeon tiles seen, Percent of items picked up (even not valuables). Etc. There may be other open or closed issues with some more suggestions (e.g., those about recording game events for the purpose of decided if quests have been completed), e.g., #129.

A related feature is to let the player add notes to particular game score entries (including games in progress). Vaguely related is #70.

The problem is where to display that. High score entries already take two lines, so perhaps we could take up one more or perhaps we'd rather show this in an additional game over menu. See #100.

This is a very open scope ticket, so hard to complete, but particular bits may be medium hard.