Move QTextEngine implementation details from QTextLayout

As of now, we'll have everything related to the additional formats handling
just in a single place. Make specialData private to prevent accessing it
from outside. This helped in tracking-down several related issues:
- in format(const QScriptItem *), the resolvedFormatIndices can not be empty
  at that point, so the code path is dead;
- in resolveAdditionalFormats(), testing if formats has not been indexed yet
  is not needed since they are indexed just in the setter;
- in useRawFont mode, hasFormats() didn't check if QTextEngine really
  has some formats, which potentially leads to formatting artifacts.

Change-Id: Id4b912888fd5a1fa83f01007170134b6386e2879
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

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