WINTERMUTE: Do some refactoring over a bunch of attrs in VideoSubtitle
WINTERMUTE: Remove Mnemonic-style //// separators
WINTERMUTE: Remove legacy c_str()
WINTERMUTE: Use Common::String in place of char *text in loadSubtitles
WINTERMUTE: Keep a bunch of attrs private in VideoSubtitler
WINTERMUTE: Treat edge case - prevents crash if SRT file is blank.
WINTERMUTE: Saving frames as uint rather than long is just as good

At 30 FPS, this allows for
2 ^ 32 / 30 / 60 = 2386093 mins, which is, I guess, a reasonable limit.
WINTERMUTE: Preserve const when handing chars over to drawText
WINTERMUTE: Add clarification comment in loadSubtitles
WINTERMUTE: Turn display() and update() into void functions.

No idea why they were bools in the first place.
WINTERMUTE: s/uint32 _lastSample/long _lastSample/
WINTERMUTE: Turn a bunch of uint into uint32 in VideoSubtitle
WINTERMUTE: Formatting
WINTERMUTE: Rename VideoSubtitle to SubtitleCard
WINTERMUTE: Avoid doing check before delete (deleting 0-pointer is safe)
WINTERMUTE: Rename VideoTheoraPlayer->_subtitles to _foundSubtitles for clarity
WINTERMUTE: Lose unnecessary if() in VideoTheoraPlayer
WINTERMUTE: Introduce BaseGame->expandStringByStringTable(&Common::String)
WINTERMUTE: Don't bother inheriting BaseGame in SubtitleCard
WINTERMUTE: Remove useless constructor from SubtitleCard.