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1. Don't build without box2d
2. Don't activate if we're missing shader support

Replaced CMake WITH_ACTIVATION_CODE by ACTIVATION_MODE. It can take
3 values, none, inapp or internal.
Add support for entering an activation code in the config dialog.
Add a new persistent config value named 'key' that holds the activation code.
On startup the key is checked in internal mode the key is checked and the
demo mode is set if the code does not match.
The configuration includes an entry box to enter the activation code.
Created another BuyMeOverlay dialog for to have one for inapp and one for
internal mode.

On some distro it is called lconvert-qt5 so we search them as well

We have to avoid confusions with the Gtk+ version

master is the future 0.60, let's label it so we can be prepared and
see the version in our tests.

We now ...

... automatically try to use a system-installed qml-box2d plugin and
    fall back to submodule build (-DQML_BOX2D_MODULE=auto, default)
... can enforce to only check for a system-installed module and error
    out if we don't find such a module (-DQML_BOX2D_MODULE=system)
... can enforce a build from the submodule
    (-DQML_BOX2D_MODULE=submodule)
    In this case we also automatically try to init && update the
    submodule on the fly.

A module from the submodule build is always installed. A system
installed module is only installed, i.e. packaged for platforms, that
need it: So far Android+SailfishOS, to-be-completed ...

Note: Also updated the qt_helper.cmake as not all Qt versions seem to
ship a Qt5::QMinimalIntegrationPlugin cmake module.

This is a temporary fix to avoid breaking the KDE CI.

Most distributions don't provide a packaged qml-box2d 2.0.
Therefore and to simplify things we build the qml-box2d automatically
as external target and install it under lib/qml/.

Therefore also GCompris now searches also in the relative path
../lib/qml for its qml plugins on desktop.

For android we add the module correspondingly.

The git submodule for now points directly to the upstream repo on
github.

Basic dynamics are working well. So far only with dummy levels. Levels
and some graphics improvements will come soon ...

Make BuildTranslations failed with ditro's Qt5. Now lrelease and
lconvert are discovered properly.

In the android store, it is mandatory to have the android release version
after the arm one. This way x86 devices can pick this version insead of
emulating the arm one.

Need to run cmake again once the files are created.
Play the good audio in instruments/memory-sound/mining audio depending
on which audio audio extension we have chosen.

When set to NO, GCompris is configured as it will run without Internet
access. It won't do any download (not implemented in this patch).

In this patch we configure the Android manifest to mention GCompris does
not requires Internet.