chore: update build script

- change project layout for better understanding.
- update build script for more close to standard cmake way.

CMakeLists.txt

@@ -1,6 +1,8 @@
+# Minimum required CMake version
 cmake_minimum_required(VERSION 3.23)
+# Project definition
 project(NeMo
-    VERSION 0.3.0
+    VERSION 0.4.0
     LANGUAGES CXX
 )
 
@@ -9,6 +11,11 @@ option(NEMO_BUILD_UNVIRT "Build Unvirt, the console interface operator of LibCmo
 option(NEMO_BUILD_BMAP "Build BMap, the example use of LibCmo which can read and write Ballance game map." OFF)
 option(NEMO_BUILD_DOC "Build document of LibCmo and all related stuff." OFF)
 
+# Set C++ standards
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
 # Setup install path from CMake provided install path for convenient use.
 include(GNUInstallDirs)
 set(NEMO_INSTALL_INCLUDE_PATH ${CMAKE_INSTALL_INCLUDEDIR} CACHE PATH
@@ -20,11 +27,14 @@ set(NEMO_INSTALL_BIN_PATH ${CMAKE_INSTALL_BINDIR} CACHE PATH
 set(NEMO_INSTALL_DOC_PATH ${CMAKE_INSTALL_DOCDIR} CACHE PATH
 "Non-arch doc install path relative to CMAKE_INSTALL_PREFIX unless set to an absolute path.")
 
-# Import essential packages
-include(${CMAKE_CURRENT_LIST_DIR}/CMake/custom_import_zlib.cmake)
-include(${CMAKE_CURRENT_LIST_DIR}/CMake/custom_import_iconv.cmake)
-include(${CMAKE_CURRENT_LIST_DIR}/CMake/custom_import_yycc.cmake)
-include(${CMAKE_CURRENT_LIST_DIR}/CMake/custom_import_stb.cmake)
+# Add our CMake in module found path
+set(CMAKE_MODULE_PATH
+    "${CMAKE_CURRENT_LIST_DIR}/CMake"
+)
+# Find required packages
+find_package(ZLIB REQUIRED)
+find_package(YYCCommonplace REQUIRED)
+find_package(STB REQUIRED)
 
 # If we are not in Windows environment, and we need to build shared library BMap,
 # we should enable PIC (position independent code), otherwise build process will fail.
@@ -36,7 +46,7 @@ if ((NOT WIN32) AND NEMO_BUILD_BMAP)
     set(CMAKE_POSITION_INDEPENDENT_CODE True)
 endif ()
 
-# Import build targets
+# Include build targets by options
 add_subdirectory(LibCmo)
 if (NEMO_BUILD_UNVIRT)
     add_subdirectory(Unvirt)