Extended the plugin system to allow for dynamic runtime bindings between modules.

As a test implementation, this allows the TablesPage to open a CrudTab for a table/view without
the need for TablesPage, CrudTab and DatabaseWindow to know anything about each other.

pglab/plugin_support/PluginContentWidgetContextBase.h

@@ -0,0 +1,19 @@
+#ifndef PLUGINCONTENTWIDGETCONTEXTBASE_H
+#define PLUGINCONTENTWIDGETCONTEXTBASE_H
+
+#include "plugin_support/IPluginContentWidgetContext.h"
+
+/// Provides base implementation of IPluginContentWidgetContext
+class PluginContentWidgetContextBase : public IPluginContentWidgetContext
+{
+public:
+	PluginContentWidgetContextBase();
+
+	void moduleAction(
+				const QString &module_identifier,
+				QString module_action,
+				const ModuleActionParameters &action_params
+				) override;
+};
+
+#endif // PLUGINCONTENTWIDGETCONTEXTBASE_H