sftime 0.3.0

• Add a dedicated tidyr::drop_na() method for sftime objects. (See the same recent addition for sf objects #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 r-spatial/sf#1958 (comment).

• 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 tcclass.
  • Did not allow to give the active time column a character vector as value.