require formatter registration
extract formatter management
Formatters support supplying information about notifications
html formatter doesnt need to extend base text formatter
handle legacy formatters
Documentation and cleanup
remove `Formatters::Collection#clear`, it's not needed.
refactor formatter collection to loader
restore early deprecation warnings
yard for legacy
reporter handles (ignores) duplicated listener notifications
ignore string vs symbol notifications and treat identically
remove to_a
fixup specs (to be refactored more)
check legacy formatter by behaviour
refactor specs to use formatter support (sends via reporter)
legacy formatter concrete example
cleanup
remove dry run, doesnt work anyway
refactor formatter support