xrCore: Do not lowercase params anymore.

Params can contain paths, which are case-sensitive in Linux
(and become invalid after lowercasing).

This commit can break application arguments, thus "-EdiTOr" would not
be considered as "-editor" option anymore, but it's OK, because there
is a number of case-sensitive arguments, which is processed via
GetCommandLine() with case-sensitive matching.

src/xrCore/xrCore.cpp

@@ -39,7 +39,6 @@ void xrCore::_initialize(LPCSTR _ApplicationName, LogCallback cb, BOOL init_fs,
         // Init COM so we can use CoCreateInstance
         // HRESULT co_res =
         Params = xr_strdup(GetCommandLine());
-        xr_strlwr(Params);
         if (!strstr(Params, "-editor"))
             CoInitializeEx(NULL, COINIT_MULTITHREADED);