mode/rst: support more list items patterns
mode/rst: support more list items patterns

Also support:

    A. upper-case letters
       and it goes over many lines

       with two paragraphs and all!

    a. lower-case letters

    I. upper-case roman numerals

    i. lower-case roman numerals

    (1) numbers again

    1) and again

Signed-off-by: Robin Jarry <469d6d325cc59f9b92eabc4e99fb576bc1f833c8@6wind.com>

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