feat: optimize out in Release builds

- fix: fastest scope matching,
- feat: try to allow the compiler to optimize out as many conditional statements as possible,
        which allow to use clutchlog for progress-only messages in Release mode.
- feat: build_all.sh test script,
- fix: typo in macro declarations in builds without clutchlog,
- update the README accordingly.

tests/t-dump.cpp

@@ -6,8 +6,6 @@
 
 int main(/*const int argc, char* argv[]*/)
 {
-#ifdef WITH_CLUTCHLOG
-
     auto& log = clutchlog::logger();
 
     log.out(std::clog);
@@ -20,5 +18,4 @@ int main(/*const int argc, char* argv[]*/)
     std::vector<int> v(3);
     std::generate(v.begin(), v.end(), std::rand);
     CLUTCHDUMP(info, v, "rand_{n}.dat");
-#endif
 }