Setup codegen metaprogram skeleton

Going use it to swap macro implementation usage in the compiler.

codegen/gen_src.cpp

@@ -0,0 +1,55 @@
+#define GEN_DEFINE_LIBRARY_CODE_CONSTANTS
+#define GEN_ENFORCE_STRING_CODE_TYPES
+#define GEN_EXPOSE_BACKEND
+#include "gencpp/gen.cpp"
+#include "gencpp/gen.builder.cpp"
+using namespace gen;
+
+#ifdef GEN_SYSTEM_WINDOWS
+	#include <process.h>
+#endif
+
+#pragma region Directories
+// Program assumes its working directory is the src directory
+#define path_src ""
+#pragma endregion Directories
+
+inline
+CodeBody parse_file( char const* path ) {
+	FileContents content = file_read_contents( GlobalAllocator, true, path );
+	CodeBody     code    = parse_global_body( StrC { content.size, (char const*)content.data });
+	return code;
+}
+
+inline
+void format_file( char const* path )
+{
+	// Need to execute clang format on the generated file to get it to match the original.
+	#define clang_format      "clang-format "
+	#define cf_format_inplace "-i "
+	#define cf_style          "-style=file:" "./scripts/.clang-format "
+	#define cf_verbose        "-verbose "
+	String command = String::make( GlobalAllocator, clang_format );
+	command.append( cf_format_inplace );
+	command.append( cf_style );
+	command.append( cf_verbose );
+	command.append( path );
+		log_fmt("\tRunning clang-format on file:\n");
+		system( command );
+		log_fmt("\tclang-format finished reformatting.\n");
+	#undef cf_cmd
+	#undef cf_format_inplace
+	#undef cf_style
+	#undef cf_verbse
+}
+
+int gen_main()
+{
+	gen::init();
+	log_fmt("Generating code for Odin's src\n");
+
+
+
+	// gen::deinit();
+	return 0;
+}