Fixes for compatibility with Clang

[jcelerier]

• floor was not available without .
• proper form is __uuidof with two underscores (https://docs.microsoft.com/en-us/cpp/cpp/uuidof-operator) ; clang only knows that one.

cheers !

[leadedge]

Thanks very much for your attention. It will take me a little while to get up to this. I can merge the changes here, but I will also include them by hand in working files before the next commit because there are other changes pending. No problems though.

[leadedge]

OK -I got a few moments free time.

What about -
#include in SpoutCopy.h
std::floor instead of "using namespace std;"
(I removed "using namespace std;" some time back due to reported problems)

[jcelerier]

okay, i'll do the change. thanks for the quick review !

[leadedge]

All sorted