Added a new dialog that helps to construct triggers for custom frame sender. Reworked custom sender window in anticipation of new functionality for triggers and modifiers

triggerdialog.h

@@ -0,0 +1,40 @@
+#ifndef TRIGGERDIALOG_H
+#define TRIGGERDIALOG_H
+
+#include <QDialog>
+#include "can_trigger_structs.h"
+#include "dbc/dbchandler.h"
+
+namespace Ui {
+class TriggerDialog;
+}
+
+class TriggerDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit TriggerDialog(QList<Trigger> triggers, QWidget *parent = nullptr);
+    QList<Trigger> getUpdatedTriggers();
+    void showEvent(QShowEvent*);
+    ~TriggerDialog();
+    QString buildEntry(Trigger trig);
+
+private:
+    Ui::TriggerDialog *ui;
+    DBCHandler *dbcHandler;
+    int lastMsgID;
+    bool inhibitUpdates;
+
+    QList<Trigger> triggers;
+
+    void FillDetails();
+    void addNewTrigger();
+    void deleteSelectedTrigger();
+    void saveAndExit();
+    void regenerateList();
+    void handleCheckboxes();
+    void regenerateCurrentListItem();
+};
+
+#endif // TRIGGERDIALOG_H