PCB does not work with hierarchical

[jwright6323]

Right now, bumps definitions that live in a hierarchical constraints dict do not get propagated to other tools, which breaks the PCB deliverables.

[jwright6323]

This is likely related to #401, if not the same

[jwright6323]

Pseudocode to fix this:

if get_hierarchical_mode == "hierarchical":
  top_module_settings = get_hierarchical_settings(top_hierarchical_module)
  bumps_mode = top_module_settings["vlsi.inputs.bumps_mode"]
  bumps = top_module_settings["vlsi.inputs.bumps"]
else:
  bumps_mode = get_setting("vlsi.inputs.bumps_mode")
  bumps = get_setting("vlsi.inputs.bumps")

[jwright6323]

While we do need to fix this, I'm lowering the priority because we aren't going to be doing a chip-on-board tapeout for a while