[os2/process]: Don't quote arguments unless needed

[flysand7]

This PR makes os2.process_start avoid quoting command line arguments, unless they are quoted. The information about which characters need to be quoted is taken from cmd/? help, but also space and a quote is added.

This fixed the behavior of running "cmd.exe" "/c" "<command>", where if /c flag is quoted, the cmd would refuse to understand the location of the command (Don't ask me I have no idea why that's a thing)

C:\Users\flysand7\raven>"cmd" /c "odin test" 
odin is a tool for managing Odin source code.
[...]

C:\Users\flysand7\raven>"cmd" "/c" "odin test" 
'"odin test' is not recognized as an internal or external command,
operable program or batch file.