attribution: in-game ODbL credit via AGigLineHUD

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The demo is built from OpenStreetMap data (ODbL 1.0) and needs attribution
wherever the derived work is shown. Add it to the running game, not just the
documents.

- AGigLineHUD (C++): plain AHUD::DrawText in the bottom-left draws
  '(c) OpenStreetMap contributors' and 'Data (c) OpenStreetMap contributors,
  ODbL 1.0 - openstreetmap.org/copyright', with a shadow pass for legibility
  over bright pavement and sky. No UMG widget asset, so a cook cannot drop it
  through a missing widget reference.
- AGigLineGameModeBase: HUDClass = AGigLineHUD, so the credit is on by default.
- AGigLineShotActor: screenshots are now requested with the UI shown, so the
  attribution appears in every capture under Screenshots/ and the obligation
  is provable in review rather than only described.

Docs: THIRD_PARTY_NOTICES records that the string is displayed in-game;
Screenshots/README documents the overlay; TODO marks the item done and
narrows the remaining ODbL question to the shipped-derivative-database
posture.

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