Migrate plugin to hoomd 4.x

Fix objects to be compatible with hoomd 4.x, remove now deprecated modules (which were moved to hoomd itself).

plugin_muMC/__init__.py

@@ -12,5 +12,4 @@ from . import _plugin_muMC
 from . import update
 from . import pair
 from . import collectives
-from . import integrate
 from . import angle
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