Enable the module only if there is a flag in the CFG file

[Gustry]

For now, AltiProfil is available on all projects, which is not expected for some Lizmap Web Client installation

Since LWC 3.8, it's now possible to make the QGIS desktop plugin aware of installed module.

We could add in the CFG file something like :

"modules": {
    "altiProfil": {
        "enabled": true,
    },
}

Or just add a variable in the QGIS project QGS file.

So the user can decide from QGIS Desktop, if this project has AltiProfil or not.