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, 2 insertions, 2 deletions

diff --git a/smtreemodel.cpp b/smtreemodel.cpp
index 98490fc..f314222 100644
--- a/smtreemodel.cpp
+++ b/smtreemodel.cpp
@@ -166,7 +166,7 @@ QModelIndex SmTreeModel::findRecursive(const QVariant &value, int column, const
     return QModelIndex();
 }
 
-bool SmTreeModel::matchRecursive(const QModelIndex &pIdx, const QRegExp &regex, int column) const {
+bool SmTreeModel::matchRecursive(const QModelIndex &pIdx, const QRegularExpression &regex, int column) const {
     if(!pIdx.isValid()){
         return false;
     }
@@ -198,7 +198,7 @@ bool SmTreeModel::matchRecursive(const QModelIndex &pIdx, const QRegExp &regex,
     return retval;
 }
 
-bool SmTreeModel::checkParents(const SmTreeItem *item, const QRegExp &regex, int column) const {
+bool SmTreeModel::checkParents(const SmTreeItem *item, const QRegularExpression &regex, int column) const {
     while(item != root()){
         QString value = item->data(column).toString();
         if(value.contains(regex)){