morph_gps should be able to combine multiple columns for date/time

[foresthayes]

Some data sources provide date and time in separate columns. The morph_gps function should be able to multiple columns to produce a single date/time column.

Data source examples:
Vectronics csv: utc_date and utc_time
ATS scrape function: year, julianday, hour, minute

Thus, the user should be able to use:
morph_gps(data, dt = c(year, julianday, hour, minute), dt_format = "%y%j%H%M")

[Huh]

tidyr::unite is a clean way to accomplish this if you are looking for ideas

[foresthayes]

Thanks, I'll try to address this at some point.