Made step to remove ASyncWindow in favour of usage of Future and FutureWatcher.

This should allow concurrency in the plugins to be independent from their container.

Contains also some work on the system for registering plugins.

pglab/plugin_support/PluginModule.cpp

@@ -0,0 +1,19 @@
+#include "plugin_support/PluginModule.h"
+
+PluginModule::PluginModule(QString name, QString ident)
+	: m_name(std::move(name))
+	, m_ident(std::move(ident))
+{
+}
+
+void PluginModule::setDisplayCategory(QString category)
+{
+	m_displayCategory = std::move(category);
+}
+
+void PluginModule::registerAction(QAction *action, MenuLocation menu_location, ToolbarLocation toolbar_location)
+{
+
+}
+
+