Include "mtext.h".

Include "mtext.h".
(M_script_lang_list): Delete it.
(language_list, script_list): New variables.
(load_lang_script_list, init_language_list, init_script_list): New
functions.
(mlang__init): Don't load language database here.
(mlang__fini): Unref language_list and script_list if not NULL.
(mlanguage__list): Delete it.
(mlanguage__info, mscript__info, mscript__char_list)
(mscript__otf_tag, mscript__from_otf_tag): New functions.
(mlanguage_list, mlanguage_code, mlanguage_name, mlanguage_text)
(mscript_list, mscript_language_list): New functions.