Missing `Sofa.Component.Visual`

[RafaelPalomar]

The following line can be problematic:

STLIB/python3/src/stlib3/scene/mainheader.py

Line 33 in ab95265

node.addObject('VisualStyle')

The reason is that the Sofa.Component.Visual plugin is not necessarily loaded at the time. The code loading the plugins is a few lines below (

STLIB/python3/src/stlib3/scene/mainheader.py

Lines 47 to 48 in ab95265

	for name in plugins:
	confignode.addObject('RequiredPlugin', name=name, printLog=False)

). This will make an error, even in the user calling the function explicitly adds "Sofa.Component.Visual".

I would either remove this call if it's not strictly needed, or add the Sofa.Component.Visual plugin right before.