Rename project, move headers to cx folder for convenience

test/test.cpp

@@ -1,13 +1,13 @@
-#include "io/print.hpp"
-#include <std.hpp>
-#include <format/obj_fmt_helper.hpp>
-#include <sync/mutex.hpp>
-#include <sync/spinlock.hpp>
+#include <cx/io/print.hpp>
+#include <cx/std.hpp>
+#include <cx/format/obj_fmt_helper.hpp>
+#include <cx/sync/mutex.hpp>
+#include <cx/sync/spinlock.hpp>
 #include <stddef.h>
 #include <pthread.h>
 #include <unistd.h>
 
-#include <logger.hpp>
+#include <cx/logger.hpp>
 
 struct Foo {
     int bar = 1;