v3.6.0

Added:

• Ignore Drone CI files in GitHub diffs
• Run black --check on CI to verify code is formatted correctly

Changed:

• Platform independent files like run_docker_build.sh are moved to .scripts folder
• Standardize and test support for multiple docker images.
• refactored conda_smithy.lint_recipe.NEEDED_FAMILIES to top level so external projects can access
• Rerun black on the codebase.

Fixed:

• fix crash when host section was present but empty
• fix build-locally.py in skip_render by not attempting to chmod +x it
• ship conf file for black so everyone uses the same settings