o.c.graphene: removing *AxisProcessVariable.
No longer needed since we are using tables.
o.c.graphene: breaking up the adapter factory.
o.c.ui.util: adding utility to throttle user input
o.c.ui.util: moving general purpose widget configuration mechanism to core.
o.c.ui.util: adding configuration widget adapters
o.c.u.pvmanager.widgets: adding standard process variable adapter mechanism.
We move them here because ui.util does not have csdata dependency.
o.c.u.pvmanager.widget, o.c.ui.util: moving configurable widgets
Didn't want to introduce further dependencies on ui.menu.
We probably need a plugin for common classes that use ProcessVariable and popup menus.
o.c.u.pvmanager.widgets: moved extension points for common stuff
o.c.graphene: removed extension points for stuff moved to core