Bump Update

[kenhoberkeley]

Bumps previously assume same x, y pitch. This updates bumps such that:

• Dimensions are now acceptable arguments for pitch key (i.e., vlsi.inputs.bumps.pitch, vlsi.inputs.bumps.pitch_x, vlsi.inputs.bumps.pitch_y are now all acceptable).
• Global bump offset is available for unaligned bumps (e.g., vlsi.inputs.bumps.global_x_offset)
• Corresponding backend tool updates.
• Fixed PCB tool to adopt this scheme.
• Fixed visualization to deal with pitch.

See: ucb-bar/hammer-cadence-plugins#87

[harrisonliew]

Awesome!

However, it looks like you broke some pcb-action unit tests that use the bumps methods. Can you fix them? Probably just an update on the method calls.

[harrisonliew]

Thanks for the new fixes!