feat: Added nav and start of npc stuff

code/core/macros.h

@@ -45,4 +45,14 @@
 	#define thread_var __thread
 #endif
 
+#define S(x) Str8_Wrap(sizeof(x) - sizeof(*(x)), (U8 *) (x))
+Str8 Str8_Wrap(S64 count, U8 *data) {
+    Str8 result;
+    result.data  = data;
+    result.count = count;
+
+    return result;
+}
+#define Sv(x) (int) (x).count, (x).data
+
 #endif  // LD_CORE_MACROS_H_