sftime 0.3.1

Correct argument versionCheck the requireNamespace for the cubble package in st_as_sftime.cubble_df().

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