Make server setting matching case-insensitive

Mainly for convenience, but also because some settings are camelCase, some settings are PascalCase, and some settings are lowercase.

And this:
http://forum.kerbalspaceprogram.com/threads/55835-KMP-v0-1-5-1-0-23-wip-alpha?p=982353&viewfull=1#post982353

EDIT: And now my spelling mistake of the branch name shall forever be in history...