refactor: core-io and core-fmt separate modules added

src/cmake/AddUnitsModule.cmake

@@ -23,9 +23,9 @@
 cmake_minimum_required(VERSION 3.15)
 
 #
-# add_system(SystemName <depependencies>...)
+# add_units_module(ModuleName <depependencies>...)
 #
-function(add_system name)
+function(add_units_module name)
     add_library(mp-units-${name} INTERFACE)
     target_link_libraries(mp-units-${name} INTERFACE ${ARGN})
     target_include_directories(mp-units-${name} INTERFACE