Tatsh / tetris-efi / #2

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travis-ci

src: render game-over title and key prompts

The game-over overlay was only drawing the grey panel; nothing told
the player the game was over or what to press. The panel now also
renders "GAME OVER" centred in a larger scale, with "N: NEW GAME"
and "Q: QUIT" stacked below at the existing UI scale. Scales
shrink-to-fit the inner box width on narrow GOP modes.

Add the missing uppercase glyphs (N, Q, W) to the 5x5 font, since
none of the existing words in the UI used them, and extend the font
test to cover them.

Signed-off-by: Andrew Udvare <audvare@gmail.com>

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