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/libs/clangbackendipc/connectionserver.cpp

@@ -57,6 +57,7 @@ ConnectionServer::ConnectionServer(const QString &connectionName)
 
 ConnectionServer::~ConnectionServer()
 {
+    killTimer(aliveTimerId);
     removeServer();
 }