Qt/GameConfigWidget: Complete overhaul

Source/Core/DolphinQt/Config/GameConfigHighlighter.h

@@ -0,0 +1,28 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+
+#include <QRegularExpression>
+#include <QSyntaxHighlighter>
+#include <QTextCharFormat>
+
+struct HighlightingRule;
+
+class GameConfigHighlighter : public QSyntaxHighlighter
+{
+  Q_OBJECT
+
+public:
+  explicit GameConfigHighlighter(QTextDocument* parent = nullptr);
+  ~GameConfigHighlighter();
+
+protected:
+  void highlightBlock(const QString& text) override;
+
+private:
+  std::vector<HighlightingRule> m_rules;
+};