testing updates bringing coverage up to 100% (except for assembly_documentation)

fixes to allow for drybox walls with hex pattern

small refactoring to bottom_bracket to handle some OCP geometry issues that were affecting part generation

black formatting changes in advance of fixes to filament_bracket

black formatting updates to build.py

alternat collet holder and tests complete

remove print output

remove unused _twist_snap_socket

better test coverage for filament_channels

moved connector_threads out of the FilamentChannels class so it can be cleanly called in other places

update to gitignore

Updated to share material recommendations per https://github.com/x0pherl/fender-bender/issues/9

eliminate dependence on the shapely library by using fb-library Point

I've ripped out all library functions and moved them into a separate project (fb-library) which can be installed through pypi

moved twist-snap functionality to fb_library