QtIFW

Use Q_GLOBAL_STATIC{_WITH_ARGS} following Qt coding conventions.

Move the regexp into its own compilation unit, so we get it only
once and use a accessor to fetch the value. I guess we should do
the same with the constants file, as all strings get compiled in
the file including it. At least Ossi wasn't satisfied currently.

Change-Id: Ic495a82f4b3cfe7810523b12cd3ef255eb15f149
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>