CPM added and directory structure changed

Switch to using CPM package manager instead of vcpkg as its just a wrapper around cmake and makes things more simple.

Switch dependency from spdlog to fmt.

Changed the directory structure to match the setup recommended by GitLab

cmake/sanitizers.cmake

@@ -0,0 +1,20 @@
+include_guard()
+
+function( target_enable_sanitizers _target )
+    if( MSVC )
+        string(FIND "$ENV{PATH}" "$ENV{VSINSTALLDIR}" index_of_vs_install_dir)
+
+        if("${index_of_vs_install_dir}" STREQUAL "-1")
+            message(
+                SEND_ERROR
+                "Using MSVC sanitizers requires setting the MSVC environment before building the project. Please manually open the MSVC command prompt and rebuild the project."
+            )
+        endif()
+
+        target_compile_options(${_target} PUBLIC /fsanitize=address /Zi /INCREMENTAL:NO)
+        target_link_options(${_target} PUBLIC /INCREMENTAL:NO)
+    else()
+        target_compile_options(${_target} INTERFACE -fsanitize=address,leak,undefined)
+        target_link_options(${_target} INTERFACE -fsanitize=address,leak,undefined)
+    endif()
+endfunction()