Addon developers: Update your addons

[dimitre]

I'm opening this issue to document a recent change where using namespace std; was removed. Maybe your addon need more explicit std:: in some places like std::min, std::cerr, etc. More details here:

https://github.com/openframeworks/openFrameworks/blob/dd09e975ad1166ea0cb48edeae35c1f75dc9ed4b/libs/openFrameworks/ofMain.h#L115-L138