Add DialogPositioner to ensure dialogs are fully on screen and remain on

screen when screen orientation changes.
Add DialPopup to allow dials to adjusted with a slider, which is easier
on touchscreens.
Add TableTapAndHold to support table context menus on touchscreens.

plugins/channelmimo/interferometer/interferometergui.cpp

@@ -19,6 +19,7 @@
 
 #include "device/deviceuiset.h"
 #include "gui/basicchannelsettingsdialog.h"
+#include "gui/dialogpositioner.h"
 #include "dsp/hbfilterchainconverter.h"
 #include "dsp/scopevis.h"
 #include "dsp/spectrumvis.h"
@@ -269,6 +270,7 @@ void InterferometerGUI::onMenuDialogCalled(const QPoint &p)
         dialog.setDefaultTitle(m_displayedName);
 
         dialog.move(p);
+        new DialogPositioner(&dialog, false);
         dialog.exec();
 
         m_settings.m_rgbColor = m_channelMarker.getColor().rgb();