Log Message:
(time/R-sftime) Updated 0.2.0 to 0.3.0

# sftime 0.3.0

* Add a dedicated `tidyr::drop_na()` method for `sftime` objects. (See
  the same recent addition for `sf` objects
  [#1975](https://github.com/r-spatial/sf/pull/1975/)).

* Add a dedicated `dplyr::dplyr_reconstruct()` method for `sftime`
  objects.  Relying on the method for `sf` objects caused erroneously
  column binding when the second object was a data frame without
  conflicting column names for the `sf` and time columns. In this case,
  a `sf` objects was returned, even though an `sftime` object should be
  returned. See also
    https://github.com/r-spatial/sf/issues/1958#issuecomment-1181982244.

* Add methods to convert `sftime` objects from:
  + Objects from the `spatstat` package classes (`ppp`, `psp`, `lpp`)
  + `sftrack` and `sftraj` objects from the `sftrack` package.
  + `cubble_df` objects from the `cubble` package.

* Bug fix in `st_time<-.sftime`:
  + Still contained references to the old `tc`class.
  + Did not allow to give the active time column a character vector as value.