v0.0.30

• Added @Package decorator to make subcircuits act like Parts.
• Interfaces now act like dictionaries so the ** operator works as expected.
• Interface I/O can now be accessed using brackets ([]) and via attributes (e.g., intfc.a).
• Interface I/O can now be assigned aliases.
• Added tee() function for creating T-junctions in networks.
• Custom ERCs can now be added using the erc_assert function.
• Aliases take precedence over default pin names.
• Substring matching in pin names can be enabled/disabled (off by default).