Improve color overriding

[mallowigi]

Currently the color overriding option requires an attribute of either iconColor or iconFolderColor with the name of the association to work. This is very limited and make the feature only relevant for bundled associations.

We need to find out better options:

• When calling loadIcon with an Association, apply a colorParser with the association's color, independently of the SVG file
• Need to find a placeholder. We can't use fill because it can be found in many paths inside the svg. We can't also use the first child of type path because it's not necessarily the case for all svg icons. So we could consider the same iconColor or folderIconColor and replace the attribute fill inside the same node.

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