Make FeatureInfoWindow working again

[justb4]

FeatureInfoWindow.vue seems to be somewhat "disconnected" from the current Wegue configuration and initialization.
Even if configured, only one Layer (layerId) can be used within a Wegue App because of modules config-(keys)-convention.

This issue is to have at least the basics working again:

• enable to be configured
• enable to be initialized
• have some demo data (with info and image URL attributes)
• possibly enable for more than just one Layer (layerId)

[justb4]

Some first results:

[fschmenger]

@chrismayer @justb4 FeatureInfoWindow has been removed as part of #224 and I think the functionality has been replaced by InfoClickWin and AttributeTable. Are we good to close this?