weather can 0.7.0

weathercan 0.7.0

• Internal updates to tests (testthat 3rd edition)
• Small changes to messages
• Switch completely to sf (remove sp dependency)
• Remove "Use with tidyverse" vignette - better to go to the source: https://r4ds.hadley.nz/
• Remove "Meteoland" vignette as functions are defunct

Bug fixes

• Fix bug with Interpolate where silently transforms non-matching timezones.
  This can produce incorrect matching when using "local-UTC" timezones
  (as weathercan does as of v0.3.0). Now timezone mismatch results in an error
  so users can decide how it should be handled.