v0.1.20

This Release:

• Adds activity_wipe_all() to clear all activities and tags
• Adds blocktank_remove_all_orders() to clear order history
• Adds blocktank_remove_all_cjit_entries() to clear CJIT entries
• Adds blocktank_wipe_all() to clear all blocktank tables
• Adds wipe_all_databases() for global database reset
• Updates tests and docs as needed
• Refactors database initialization code to reduce duplication
• Ensures consistent error handling across all wipe methods