Support contexts with lifetime bounds

Another redesign was necessary to enable the usage of references in a generic context.

Changes:

• Automation is replaced by AutomatedValue
• AutomationContext is replaced by QueryInfo
• AutomatableValue is replaced by Automatable
• AutomatedValue is replaced by Automated
• AutomationSpec is replaced by AutomatableParam
• creator::Creator is replaced by automation::AutomationFactory
  • Example usages:
    • factory.automate(automatable).into_automation(automation_fn)
    • factory.automate(automatable).into_stage(stage_fn)
  • To access the former render_window_secs variable, inject RenderWindowSecs as an Automatable instead
• AutomatedValue (former Automation) and Stage are now parameterized over Q: QueryInfo
• AutomationFactory (former Creator) is now parameterized over C: CreationInfo