Change distutils.spawn.find_executable to shutil.which

Try another fix for string type rather than a255

Updated to copy input image data to output array rather than assignin…

…g so output data type is maintained. Hopefully fixing a potential bug.

Hopefully fixed a windows build issue.

Fix for rios v2.0 in how the progress bar is called.

Bug fix.

Added .bat files to be installed in windows so command line tools can…

… be used

Add legend to rsgislib.tools.plotting.plot_vec_fields plots.

Updated code formatting using black

Update position of cmake min version requirement to top of file.