QbsProjectManager: Logging improvements.

- Make messages with level "warning" or "error" appear in the Issues
  pane.
- Do not suppress messages of level "info". People add "console.info()"
  calls into their projects for debugging and they expect to see the
  output in Creator.

Task-number: QTCREATORBUG-15983
Change-Id: I6c84bc1ef08dbf85d7e88af864b18f64fcedfe1a
Reviewed-by: Jake Petroules <jake.petroules@qt.io>

src/plugins/qbsprojectmanager/qbslogsink.cpp

@@ -79,6 +79,10 @@ void QbsLogSink::doPrintMessage(qbs::LoggerLevel level, const QString &message,
 
     {
         QMutexLocker l(&m_mutex);
+        if (level <= qbs::LoggerWarning) {
+            doPrintWarning(qbs::ErrorInfo(message));
+            return;
+        }
         m_messages.append(qbs::logLevelTag(level) + message);
     }
     QMetaObject::invokeMethod(this, "sendMessages", Qt::QueuedConnection);

src/plugins/qbsprojectmanager/qbsprojectmanager.cpp

@@ -78,7 +78,7 @@ QbsManager::QbsManager() :
             this, &QbsManager::updateAllProfiles);
 
     m_logSink = new QbsLogSink(this);
-    int level = qbs::LoggerWarning;
+    int level = qbs::LoggerInfo;
     const QString levelEnv = QString::fromLocal8Bit(qgetenv("QBS_LOG_LEVEL"));
     if (!levelEnv.isEmpty()) {
         bool ok = false;