Dive list: implement proper Qt-model semantics for DiveTripModel

Previously, each dive-list modifying function would lead to a
full model reset. Instead, implement proper Qt-model semantics
using beginInsertRows()/endInsertRows(), beginRemoveRows()/
endRemoveRows(), dataChange().

To do so, a DiveListNotifer singleton is generatated, which
broadcasts all changes to the dive-list. Signals are sent by
the commands and received by the DiveTripModel. Signals are
batched by dive-trip. This seems to be an adequate compromise
for the two kinds of list-views (tree and list). In the common
usecase mostly dives of a single trip are affected.

Thus, batching of dives is performed in two positions:
- At command-level to batch by trip
- In DiveTripModel to feed batches of contiguous elements
  to Qt's begin*/end*-functions.

This is conceptually simple, but rather complex code. To avoid
repetition of complex loops, the batching is implemented in
templated-functions, which are passed lambda-functions, which
are called for each batch.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

desktop-widgets/mainwindow.cpp

@@ -36,6 +36,8 @@
 #include "core/settings/qPrefPartialPressureGas.h"
 #include "core/settings/qPrefTechnicalDetails.h"
 
+#include "core/subsurface-qt/DiveListNotifier.h"
+
 #include "desktop-widgets/about.h"
 #include "desktop-widgets/command.h"
 #include "desktop-widgets/divecomputermanagementdialog.h"
@@ -492,8 +494,6 @@ void MainWindow::refreshDisplay(bool doRecreateDiveList)
 	dive_list()->setFocus();
 	WSInfoModel::instance()->updateInfo();
 	ui.actionAutoGroup->setChecked(autogroup);
-	if (amount_selected == 0)
-		cleanUpEmpty();
 }
 
 void MainWindow::recreateDiveList()