bug#44267: New input method 'compose'

[Juri Linkov]

> This input method was based on the existing Unicode input methods
> "TeX", "rfc1345", "sgml" that all use "UTF-8".  And `M-x list-input-methods'
> puts all them under the "UTF-8" category.
>
>> This new method should be called out in NEWS.
>
> Maybe something like this:
>
> diff --git a/etc/NEWS b/etc/NEWS
> index 24f0acf0fb..b4b9e87499 100644
> --- a/etc/NEWS
> +++ b/etc/NEWS
> @@ -129,6 +129,9 @@ Emacs to break lines after more characters than just 
> whitespace
>  characters.  In particular, this significantly improves word-wrapping
>  for CJK text mixed with Latin text.
>  
> +---
> +** New input method 'compose' based on X Multi_key sequences.
> +
>  ---
>  ** Improved language transliteration in Malayalam input methods.
>  Added a new Mozhi scheme.  The inapplicable ITRANS scheme is now

Pushed to the trunk.