sketch out os api, binary stream writer in js, app sleep when no animation, local and universal time

src/os/os.h

@@ -9,4 +9,42 @@ struct os_date_t {
     u16 year;
 };
 
-fn os_date_t os_date_now(void);
+fn os_date_t os_local_time_now(void);
+fn os_date_t os_universal_time_now(void);
+fn f64       os_milliseconds_now(void);
+
+#if 0
+fn u64            os_microseconds_now();
+fn f64            os_seconds_now();
+fn u32            os_unix_time_now();
+
+fn os_date_t      os_local_time_to_universal_time();
+fn os_date_t      os_universal_time_to_local_time();
+
+fn void           os_sleep_milliseconds();
+
+
+fn s8_t           os_list_files(arena, path, recursive);
+fn os_file_iter_t os_iterate_files();
+fn void           os_advance()
+fn b32            os_is_valid();
+
+fn s8_t           os_read_file(ma_arena_t *arena, s8_t path);
+fn void           os_write_file(s8_t path, s8_t content);
+fn void           os_make_dir(s8_t path);
+fn os_result_t    os_copy_file(s8_t from, s8_t to, b32 overwrite);
+fn os_result_t    os_delete_file(s8_t path);
+fn i64            os_get_file_mod_time(s8_t path);
+
+fn b32            os_path_exists(s8_t path);
+fn b32            os_path_is_dir(s8_t path);
+fn b32            os_path_is_file(s8_t path);
+fn b32            os_path_is_abs(s8_t path);
+fn b32            os_path_is_rel(s8_t path);
+fn s8_t           os_path_to_abs(ma_arena_t *arena, s8_t path);
+
+fn s8_t           os_path_exe(ma_arena_t *arena);
+fn s8_t           os_path_exe_dir(ma_arena_t *arena);
+fn s8_t           os_path_cwd(ma_arena_t *arena);
+fn void           os_path_set_cwd(s8_t path);
+#endif