Housekeeping

[ElianHugh]

• combine doesn't allow character-coercible values to be passed to it
  • qto_span(1) results in an error
• can't pass c() values to class and id parameters
  • vectors should be recycled and concatenated after prefixing
  • callout, with_* not passing along class attribute
• probably should be prefixing all imports rather than global importing them