Slightly change CLI argument processing

[mathbr]

Deluge-console accepts commands as CLI arguments. However commands with parameters do not work as expected:

$ deluge-console add <file> → Does not work

$ deluge-console "add <file>" → Works but is awkward and prevents quoting of <file> as well as shell autocompletion

This patch changes this to allow for the former style to work.

[mathbr]

Slightly tweak command arguments processing

[Cas]

You should be still able to quote the file with the single quote '

Note that there are some big changes for the console currently under development by nick:  https://github.com/nicklan/newconsoleui

[damoxc]

Applied in 93c4949.