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.

CMakeLists.txt

@@ -16,9 +16,6 @@ set(VERSION_MINOR 1 CACHE STRING "Minor version number" )
 set(VERSION_PATCH 0 CACHE STRING "Patch version number" )
 mark_as_advanced(VERSION_MAJOR VERSION_MINOR VERSION_PATCH)
 
-# There's no point building clutchlog tests in Release
-set(CMAKE_BUILD_TYPE Debug)
-
 set(CMAKE_CXX_STANDARD_LIBRARIES -lstdc++fs)
 
 ######################################################################################
@@ -33,6 +30,10 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 # Dump used compiler flags.
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
+option(WITH_CLUTCHLOG "Define WITH_CLUTCHLOG, whatever the build type." OFF)
+if(WITH_CLUTCHLOG)
+    add_definitions(-DWITH_CLUTCHLOG)
+endif()
 
 ######################################################################################
 # Start building