start refactoring the event_class logic into scoring_helpers, starting with Distance
revert the Distance path-display code to previous 'helper'
update to use a externally_ranked_scoring_class helper
create artistic_scoring_class helper
create flatland and street scoring_helpers
add scoring helpers
rename distance_scoring_class to race_scoring_class, create new distance_scoring_class
clean up all places where we used to switch on event_class, replace with calling scoring_helper directly
remove old scoring-entry pages, routes, and helper
remove unneeded printing competitions path
update wicked_pdf, and also fix the styling so that pdf's display text again (broken when we re-styled the rest of the site)
fix tests broken when removing old event-data-entry pages