Save and load edited shaders as capture modifications

* When a shader edit is loaded with a capture, it's loaded as "pending" and not
  immediately applied.

qrenderdoc/Windows/MainWindow.cpp

@@ -1071,6 +1071,8 @@ bool MainWindow::PromptCloseCapture()
       text += tr("Bookmarks have been changed.\n");
     if(mods & CaptureModifications::Notes)
       text += tr("Capture notes have been changed.\n");
+    if(mods & CaptureModifications::EditedShaders)
+      text += tr("Edited shaders have been changed.\n");
 
     bool saveas = false;