upgrade to qt 6 compliance

app/common/html.cpp

@@ -12,22 +12,7 @@ const QVector<QString> Html::kBlockTags = {
   QStringLiteral("div")
 };
 
-inline bool StrEquals(const QString &a, const QStringRef &b)
-{
-  return !a.compare(b, Qt::CaseInsensitive);
-}
-
-inline bool StrEquals(const QString &a, const QString &b)
-{
-  return !a.compare(b, Qt::CaseInsensitive);
-}
-
-inline bool StrEquals(const QStringRef &a, const QString &b)
-{
-  return !a.compare(b, Qt::CaseInsensitive);
-}
-
-inline bool StrEquals(const QStringRef &a, const QStringRef &b)
+inline bool StrEquals(const QStringView &a, const QStringView &b)
 {
   return !a.compare(b, Qt::CaseInsensitive);
 }
@@ -421,7 +406,7 @@ QMap<QString, QStringList> Html::GetCSSFromStyle(const QString &s)
     // match. Also commas should be filtered out.
     QStringList values;
     const QString &val = kv.at(1);
-    QChar in_quote = 0;
+    QChar in_quote(0);
     QString current_str;
     for (int i=0; i<val.size(); i++) {
       const QChar &current_char = val.at(i);
@@ -429,7 +414,7 @@ QMap<QString, QStringList> Html::GetCSSFromStyle(const QString &s)
       if (!in_quote.isNull()) {
         // If inside quotes and character isn't quote, indiscriminately append char
         if (current_char == in_quote) {
-          in_quote = 0;
+          in_quote = QChar(0);
         } else {
           current_str.append(current_char);
         }

app/common/memorypool.h

@@ -25,7 +25,6 @@
 #include <QApplication>
 #include <QDateTime>
 #include <QDebug>
-#include <QLinkedList>
 #include <QMutex>
 #include <QTimer>
 #include <stdint.h>

app/common/ratiodialog.cpp

@@ -22,6 +22,7 @@
 
 #include <QCoreApplication>
 #include <QMessageBox>
+#include <QRegularExpression>
 
 namespace olive {
 
@@ -49,7 +50,7 @@ double GetFloatRatioFromUser(QWidget* parent,
       return qSNaN();
     }
 
-    QStringList ratio_components = s.split(QRegExp(QStringLiteral(":|;|\\/")));
+    QStringList ratio_components = s.split(QRegularExpression(QStringLiteral(":|;|\\/")));
 
     if (ratio_components.size() == 1) {
       bool float_ok;

app/common/timecodefunctions.cpp

@@ -24,6 +24,7 @@ extern "C" {
 #include <libavutil/mathematics.h>
 }
 
+#include <QRegularExpression>
 #include <QtMath>
 
 #include "config/config.h"
@@ -149,7 +150,7 @@ int64_t Timecode::timecode_to_timestamp(const QString &timecode, const rational
   case kTimecodeSeconds:
   {
     const int kTimecodeElementCount = 4;
-    QStringList timecode_split = timecode.split(QRegExp("(:)|(;)|(\\.)"));
+    QStringList timecode_split = timecode.split(QRegularExpression("(:)|(;)|(\\.)"));
 
     bool valid;