[O] [suggest] We should import latex template system

[Feng Shu]

Hi:

org-mode odt exporter are using 'org-odt-styles-file, which are odt
templetes, I think latex exporter should do like this. for example:

   
org-latex-styles-file  or  org-latex-templete-file


we can include many different language's templates into org, and no need
touch the ox-latex.el and the user can write theirs template easily,



we can use "locale" to determine which template will be used



converting latex fragements can use templates too, like:


org-latex-fragment-templete-file



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