Solving issue 2161: "Hide Filmstrip elements"

"t" has been remapped to "Ctrl+t" to show the content of the Trash
"t" now show/hide the film strip and update the size of the allocated space
"Shift-t" show/hide the film strip and keep the allocated space identical, preventing a main preview refresh

rtgui/preferences.h

@@ -113,6 +113,8 @@ class Preferences : public Gtk::Dialog, public ProfileStoreListener {
     Gtk::Button*    addExt;
     Gtk::Button*    delExt;
     Gtk::CheckButton* overlayedFileNames;
+    Gtk::CheckButton* filmStripOverlayedFileNames;
+    Gtk::CheckButton* sameThumbSize;
 
     Gtk::SpinButton*  rgbDenoiseTreadLimitSB;