Add more actions and improve error message when dragged into empty actions container

src/editor/dialogs/actions/speedverticaldialog.cpp

@@ -0,0 +1,19 @@
+#include "speedverticaldialog.h"
+#include "ui_speedverticaldialog.h"
+
+#include <QPushButton>
+
+SpeedVerticalDialog::SpeedVerticalDialog(SpeedVerticalAction &action, QWidget *parent) :
+    QDialog{parent},
+    m_ui{std::make_unique<Ui::SpeedVerticalDialog>()},
+    m_action{action}
+{
+    m_ui->setupUi(this);
+
+    if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Ok))
+        button->setIcon(QIcon{":/qtgameengine/icons/ok.png"});
+    if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Cancel))
+        button->setIcon(QIcon{":/qtgameengine/icons/delete.png"});
+}
+
+SpeedVerticalDialog::~SpeedVerticalDialog() = default;