weston-ini-conf: Add weston-ini-config-no-activate

weston-ini-conf: Add weston-ini-config-no-activate

This patch adds a way to tick dynamically activate-by-default to false,
and provide a safe migration towards disabling by default activation
entirely.

We do this with just only the Qt toolkit and will proceed with
WAM/chromium once that has support as well for this.

Bug-AGL: SPEC-4528
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: I3573ea92d3ea865db223bd01e58b9ec202cfa7ae
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/27990
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>