[C++] Rewrite of the preprocessor.

This rewrite fixes a couple of issues with the pre-processor. It now
supports:
- macros in macro bodies
- stringification of parameters [cpp.stringize]
- the concatenation operator [cpp.concat]
- #include MACRO_HERE
- defined() inside macro bodies used in pp-conditions.

Change-Id: Ifdb78041fb6afadf44f939a4bd66ce2832b8601f
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

src/libs/cplusplus/cplusplus-lib.pri

@@ -51,9 +51,9 @@ HEADERS += \
     $$PWD/pp.h \
     $$PWD/pp-cctype.h \
     $$PWD/pp-engine.h \
-    $$PWD/pp-macro-expander.h \
     $$PWD/pp-scanner.h \
-    $$PWD/findcdbbreakpoint.h
+    $$PWD/findcdbbreakpoint.h \
+    $$PWD/PPToken.h
 
 SOURCES += \
     $$PWD/SimpleLexer.cpp \
@@ -78,8 +78,8 @@ SOURCES += \
     $$PWD/FastPreprocessor.cpp \
     $$PWD/Macro.cpp \
     $$PWD/pp-engine.cpp \
-    $$PWD/pp-macro-expander.cpp \
     $$PWD/pp-scanner.cpp \
-    $$PWD/findcdbbreakpoint.cpp
+    $$PWD/findcdbbreakpoint.cpp \
+    $$PWD/PPToken.cpp
 
 RESOURCES += $$PWD/cplusplus.qrc