rename pluginlist module to plugindialogs
Add display_plugin_properties to modify properties
from an element.
Add a way to modify the location if element is URI_TYPE_SRC
Able to remove a node from the graph
Treeview row actions:
- A selection will display element information.
- A double click add a new element in the app.graph structure.
The plugin list dialog is an item from gps.ui
