This will eventually fix a few leaks we introduced in the semantic highlighter.

Reviewed-by: Roberto Raggi

This will allow much faster indenting of selected areas as the state
doesn't have to be checked again for every line.

There are cases like when editing, or when jumping to a line, where we
shouldn't cut it though (so we don't).

Task-number: QTCREATORBUG-1535

 * Use tr if a tr method is available at the object
 * Use QT_TRANSLATE_NOOP for global string constants
 * Do not offer to translate stuff inside QLatin1String and QLatin1Literal
 * Do not offer to wrap strings inside tr, trUtf8 and QT_TRANSLATE_NOOP
   with QLatin1String

Reviewed-by: Roberto Raggi

Task-number: QTCREATORBUG-1776

 * Mark a string literal as translateable, using either
   tr() (if the object is perived from QObject) or
   QCoreApplacation::translate().

A mostly mechanical change.

Reviewed-By: con

Task-number: QTCREATORBUG-1169

The second line test could be misread by both the compiler or the reader.
gcc even warns about this, so add brackets just to make sure.