[KSP2] command line doesn't support absolute Windows paths

[joffrey-bion]

The command line doc specifies that lists must be colon-separated, even for lists of paths.

Because of this, Windows paths like C:\MyDir are interpreted as 2 directories:

• a relative dir C, which is undesired
• an absolute dir /MyDir, which may end up in the right place if the working dir is in the same drive, but is not correct in general

This is because the generated argument parser simply splits on :, disregarding quotes or system-specific path separators.

It would be great it the CLI accepted the system's path-separator as a separator for paths lists (like Java's -cp argument).