PeterW changed some stuff about the INI parser. I adjusted the parsing of the version info from the masterserver to fit his change
and let the C4Network2RefClient inherit from the C4Network2UpdateClient (as refclient does the same as updateclient only more) while I was at it.
This time with more manual checking and using git blame -M -C, so that
a few cases of copied code get a copyright notice corresponding to
their initial introduction.
This is a whitespace-only patch. Hopefully, it'll only affect rarely-changed
parts of the engine, since all regularly maintained pieces should already
use tabs.