Plotter: Move new plots on same drive, not copy and remove

[djdookie]

I propose the plotter process simply detects if temp and destination directory are on the same drive and then moves the new plots, instead of copying and subsequently removing them from the source directory. This would save a lot of time, because moving on the same drive only takes milliseconds instead of 10 minutes in this example (because moving only changes the file reference in the file table):

Copied final file from "C:\\ChiaTemp\\plot-k32-xxxxxx.plot.2.tmp" to "C:\\ChiaPlot\\plot-k32-xxxxxx.plot.2.tmp"
Copy time = 595.666 seconds. CPU (11.870%) Wed May 12 07:39:30 2021
Removed temp2 file "C:\\ChiaTemp\\plot-k32-xxxxxx.plot.2.tmp"? 1

This would save a lot of plotting time for a simple cheap change in the code, because the next sequential plot on the same drive usually has to wait for the copy to finish. Especially on HDDs where you don't want to create plots in parallel.