Feat

• raise new TaskError exception on task errors
• raise InteractiveSessionError when prompting in non-interactive environment

Fix

• settings: use <CONFIG_ROOT>/copier as settings directory on Windows (#2071)
• updating: ignore last answer of when: false questions
• restore access to full rendering context in prompt phase

Refactor

• re-expose API with deprecation warnings on non-public API imports
• rename internal modules with a _ prefix