QbsPM: Do not delay initial parsing

When a project is opened, delayParsing() is called several times:
* activeTargetChanged -> buildConfigurationChanged
* environmentChanged
* startupProjectChanged -> ... -> buildDirectoryChanged

delayParsing starts a 1s timer for aggregating all the relevant changes
before starting the actual parse.

This makes sense also when the user makes changes (like switching build
configurations fast, or editing the build directory).

When the project is opened initially, there's no reason to wait before
parsing.

Change-Id: I4eb0c7d3419465bc01e8f9febc9ee808684adb6e
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/projectexplorer/project.cpp

@@ -637,6 +637,10 @@ void Project::setProjectLanguage(Core::Id id, bool enabled)
         removeProjectLanguage(id);
 }
 
+void Project::projectLoaded()
+{
+}
+
 Core::Context Project::projectContext() const
 {
     return d->m_projectContext;