Make it run with Qt6

This is a huge commit. Changes:
* Obviously, make it compile
* Make it run (only scarcely tested)
* get rid of most of clang's warnings

Let's see what surprises are in store...

1 files changed, 4 insertions, 4 deletions

diff --git a/picfilesmodel.cpp b/picfilesmodel.cpp
index 313c5a5..36d37c5 100644
--- a/picfilesmodel.cpp
+++ b/picfilesmodel.cpp
@@ -29,7 +29,7 @@ PicFilesModel::PicFilesModel(const QStringList &headers, QObject *parent) : SmTr
 void PicFilesModel::setMapping(int pMapId){
     QList<QVariant> ids = mMappingTreeModel->childList(pMapId, MappingTreeModel::MappingId);
     mMappingIds.clear();
-    for(QVariant i : ids){
+    for(const auto &i : ids){
         mMappingIds << i.toInt();
     }
 }
@@ -89,7 +89,7 @@ QList<QVariant> PicFilesModel::dataList(const QModelIndex &idx){
     }
     QList<MappingData> mapData = mappingDataFromFile(idx.data(PicFilesModel::IdRole).toInt());
     QList<QStringList> mappings;
-    for(MappingData d : mapData){
+    for(const auto &d : mapData){
         mappings << d.path;
     }
 
@@ -145,7 +145,7 @@ bool PicFilesModel::changeMappings(const QList<int> &fileIds, const QList<QVaria
         if(!deleteMappingsQ.exec()){
             goto error;
         }
-        for(QVariant pid : parentIds){
+        for(const auto &pid : parentIds){
             addMappingsQ.bindValue(":pid", fid);
             addMappingsQ.bindValue(":id", pid);
             if(!addMappingsQ.exec()){
@@ -329,7 +329,7 @@ void PicFilesModel::selectFromRecent(int days){
 void PicFilesModel::selectFromSelection(QList<QVariant> ids){
     mAllPics.clear();
     QStringList idQS;
-    for(QVariant i : ids){
+    for(const auto &i: ids){
         idQS << QString::number(i.toInt());
     }
     QString inPart = idQS.join(',');