Clang: Reparse only if files are changed

Includes are now watched by a file watcher. Unsaved file changes are
watched too. If they are changed the translation units which depend on
them are set to a state which require a reparse. Later the diagnostics
of this units are collected and send back to creator.

Change-Id: I2fb5c7dd6644687f22399edd8d18edd6215c9505
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/tools/clangbackend/ipcsource/clangbackendclangipc-source.pri

@@ -22,7 +22,8 @@ HEADERS += $$PWD/clangipcserver.h \
     $$PWD/sourcelocation.h \
     $$PWD/sourcerange.h \
     $$PWD/fixit.h \
-    $$PWD/diagnosticsetiterator.h
+    $$PWD/diagnosticsetiterator.h \
+    $$PWD/clangfilesystemwatcher.h
 
 SOURCES += $$PWD/clangipcserver.cpp \
     $$PWD/codecompleter.cpp \
@@ -45,4 +46,5 @@ SOURCES += $$PWD/clangipcserver.cpp \
     $$PWD/diagnostic.cpp \
     $$PWD/sourcelocation.cpp \
     $$PWD/sourcerange.cpp \
-    $$PWD/fixit.cpp
+    $$PWD/fixit.cpp \
+    $$PWD/clangfilesystemwatcher.cpp