Introduce ProcessProgress

This is extracted separate object out of VcsCommand.
It's responsible for showing progress of the running
process. It's able to cancel the running process
automatically after pressing a small 'x' indicator on
progress panel. In this case the QtcProcess::stop()
method is being called.

Change-Id: I9fa94fd047638f76909356ae4023852349be3a06
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/qtcprocess.cpp

@@ -1750,6 +1750,11 @@ void QtcProcess::setTimeoutS(int timeoutS)
         d->m_maxHangTimerCount = INT_MAX / 1000;
 }
 
+int QtcProcess::timeoutS() const
+{
+    return d->m_maxHangTimerCount;
+}
+
 void QtcProcess::setCodec(QTextCodec *c)
 {
     QTC_ASSERT(c, return);