Add application role 'Sample'

Sample hotkey which requires access to CGuiApplication, did not yet
set a application role. Since there was no corresponding role for
samples, I added one and set it in sample hotkey.

samples/hotkey/main.cpp

@@ -22,7 +22,7 @@ int main(int argc, char *argv[])
 {
     CGuiApplication::highDpiScreenSupport();
     QApplication qa(argc, argv);
-    CGuiApplication a;
+    CGuiApplication a("samplehotkey", BlackMisc::CApplicationInfo::Sample, QPixmap());
     BlackGui::Components::CSettingsHotkeyComponent w;
     w.show();
     return a.exec();

src/blackmisc/applicationinfo.h

@@ -32,7 +32,8 @@ namespace BlackMisc
             PilotClientCore,
             PilotClientGui,
             MappingTool,
-            UnitTest
+            UnitTest,
+            Sample
         };
 
         //! Flags describing application modes