Change handling of backslash/slash in configs

[patrickpichler]

As of right now, all / in the config will be replaced with \ on windows. This
could lead to some strange behaviors, such as replacing / in names.

This is done solely to handle paths on windows, but if you think about it, there
is no need to replace every / in the config, as we read files from disk only once
at the beginning. Afterwards / could always be used to reference other configs.

[tatomir146]

Will be solved with monaco config 2.0