Change to usethis will require updates to bcgovr

[boshek]

Highlighting the fragile approach of relying on unexported functions, bcgovr will need to make some changes to accomodate an upcoming update of usethis. My initial survey indicates these internal functions have changed:

is_proj is now is_in_proj
bullet is not done_buller et al.

There may also be more substantive changes which will also require bcgovr code modifications.