Sqlite: Cleanup Sqlite

We don't need the threading anymore, so we removed it. The indexer
will be run in its thread anyway, so an extra thread makes the code
only more complicated. And we added namespaces.

Change-Id: Ibcba306324763285cf653c28bb08122345e5f8da
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/sqlite/sqlitetransaction.h

@@ -27,6 +27,8 @@
 
 #include "sqliteglobal.h"
 
+namespace Sqlite {
+
 class SQLITE_EXPORT SqliteAbstractTransaction
 {
 public:
@@ -35,7 +37,7 @@ public:
     void commit();
 
 private:
-    bool isAlreadyCommited = false;
+    bool m_isAlreadyCommited = false;
 };
 
 
@@ -59,3 +61,5 @@ public:
     SqliteExclusiveTransaction();
 
 };
+
+} // namespace Sqlite