Reviewed-by: Erik Verbruggen

In preparation for finding macro uses.

* Macro: add offset and length
* MacroUse: add line
* Document: add convenience functions for finding a macro definition, use
  or undefined use at a given location.

Reviewed-by: Erik Verbruggen

Several special cases that are handled by the CPPEditor did not take
into account code that was using tab characters.

Task-number: QTCREATORBUG-292
Reviewed-by: Roberto Raggi

Encapsulate the details.

the new approach makes it possible to use more edit features
inside the rename selection like cut/copy/paste. Furthermore
it compresses rename operations better on the undo stack.

This handles the case with the selection inside the name correctly, and
aborts when part of the selection is outside of the name. Previously, a
selection could cause the text to get inserted backwards.

Task-number: QTCREATORBUG-302
Reviewed-by: Roberto Raggi

Remove overlap. Add extra selection tooltips for the cpp hover handler.

Introduce new QString id() const-API and sort wizards by
[untranslated] category and id. Introduce respective constants.
Rubber-stamped-by: con <qtc-committer@nokia.com>

a op b -> !(a invop b)
and
a op b -> b flipop a

We need to port the code to use the new overloay system.

Reviewed-By: Christian Kamm <christian.d.kamm@nokia.com>