New syntax highlighter not complete.

- Supports comments
- more efficient as it scans the text block instead of repeatedly searching throught the whole block
- type matching based on catalog (but need to add aliases manually)
- added many keywords

todo:
- heap corruption bug
- symbol stops at special char like parenthese or operator or something similar.

querytab.h

@@ -18,7 +18,7 @@ namespace Ui {
 
 class QTabWidget;
 class MainWindow;
-class SqlHighlighter;
+class SqlSyntaxHighlighter;
 class ExplainRoot;
 class QueryResultModel;
 class QueryExplainModel;
@@ -64,7 +64,7 @@ private:
 
 	Ui::QueryTab *ui;
 	MainWindow *m_win;
-	std::unique_ptr<SqlHighlighter> highlighter;
+	SqlSyntaxHighlighter* highlighter;
 	ConnectionConfig m_config;
 	StopWatch m_stopwatch;
 	ParamListModel m_paramList;