In particular macros that are only checked for definition or are
expanded during the evaluation of an #if or #elif directive are now also
added to the list available through Document::macroUses().

The names of undefined macros that are interesting (because they're used
in an #ifdef or a defined(...)) are now available through
Document::undefinedMacroUses().

Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

Added BackwardsScanner::mid(tokenIndex). Mid() returns a substring starting from the position of the given token.

Basically for all widgets that don't have navigationWidgetHeight
it is removed, because then the proportions are wrong.

Reviewed-by: Erik Verbruggen

This splits up the edit and active settings. Let people try it and
report usability problems. I'm not 100% convinced of the layout either.

Reviewed-by: Trustme

Task-number: 258468

Things you mustn't do:
1) end an enum with a comma

2) #include <cxxxx> and not use std::

3) use anonymous structures

All three things are invalid C++. Anonymous structures inside
anonymous unions are allowed by GCC, but that doesn't mean it's valid.

Snapshot::dependsOn(fn) returns the files in the snapshot that depends on fn.

Add missing Q_OBJECTS where tr() was used.