missing UM namescape for marco

[gloook]

um_assert macro works only after using namespace UM;

It would always work if adding "UM::" in lines 14 and 16 of assert.h:

#define CUR_SOURCE_LOCATION UM::source_location{FILE, LINE, PRETTY_FUNCTION} #define CUR_SOURCE_LOCATION UM::source_location{FILE, LINE, FUNCSIG}