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Try to speedup painting

This is a follow up on the MR to fix the braille characters. I'v realized that we are doing too many multiplications (terminalDisplay->loc()) and because the calls where done to lambdas it's impossible to test them.

By caching the Character accessed by terminalDisplay->loc() we eliminate at least ~20 multiplications per cell. And the resulting code is more testable. Tests not done - too sleepy for that now.

@hindenburg @ahmadsamir @waqar @apol

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