CLI should be able to understand filenames with spaces

[stevesims]

a filename with a space in it can't be used in the CLI at present. (well, you can via using wildcards with some commands)

these files can exist in the filing system, and can be saved via the API but the method of extracting arguments from the CLI will split at space characters

it should be possible to have arguments enclosed by double-quote characters, so "long file name.txt" for instance should be interpreted as a single argument - and the quotes excluded when the filepath is being used

(the tab-completion system will also see filenames with spaces in them and tab-complete them, but then those files cannot be used. tab-completed filenames that include spaces should enclose the whole filename in double-quotes)

[stevesims]

This is now partially supported. Tab completion however does not yet understand spaces in filenames