Use default files for default user profiles

[CodyRay]

I am hoping to make a custom version of Cmder with some defaults configured for our organization - as part of that it would be great if the default content of the user-profile files came from default files like user-aliases.example does. That way it should be easier able to keep our fork in sync and makes it easier to compare with the default config.

This PR pulls the default contents of the file out into their own files. I also took the liberty of calling these ".default" files and renamed the "user-aliases.cmd.example" for consistency with "ConEmu.xml.default" - are there any upgrade considerations for that change?

[daxgames]

@haroldhues Thanks and I don't know why we didn't do all of this a long time ago.

Have you looked at the cmder.exe /c [path] argument. It allows running Cmder from a central location using config from the central location then applying user unique config from [path] on top of that. Any change to the central location automatically applies to any user the next time they run it with no need to copy config to the users workstation. See: PR #1949 for a detailed explanation.

[daxgames]

See inline comments for requested changes.