Add password widget and solid-map cluster option

Add solid-form-password widget, solid-map clustering attribute (and autosave in list attributes).

source/import_documentation/Components/Solid-Map.rst

@@ -50,6 +50,12 @@ added to interact with the list of data being displayed.
 ~~~~~~~~~~
   List of the fields to display in a popup which opens when a marker is clicked. If the attribute is not defined, no popup will show up.
 
+``clustering``
+~~~~~~~~~~~~~~
+  *Available from version 0.16*
+
+  If this attribute is defined, markers spacially close are grouped in clusters.
+
 Events
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