Revert to non strict mode for qml expressions etc.

Forcing them to strict lead to too many incompatibilites
to 5.1, so let's rather leave them non strict

Change-Id: I7c3bafc9a840daa565add7abbad0d0042cdae332
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Disable some debugger tests until we have a reimplementation for v4

Change-Id: I273fba969c72299e84c091afd7d4a43f9dbd1bf8
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>