Merge in numerous local fixes:

- when outputing character to the screen check that we actually have a
  character for the charcode supplied. This fixes potential segfault
  when user types in some character that isn't in the table;
- don't hog all CPU time when playing level completion sound. This also
  makes level completion sound much more less jerky;
- by default use sdl12 library instead of sdl10, because sdl10 is at the
  end of its lifecycle and would be retired RSN.

Bump PPORTREVISION to indicate that major changes were made.

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