Markdown reader: make definition lists behave like other lists.

If the `four_space_rule` extension is not enabled,
figure out the indentation needed for child blocks dynamically,
by looking at the first nonspace content after the `:` marker.

Previously the four-space rule was always obeyed.

Remove the old `compact_definition_lists` extension. This was
neded to preserve backwards compatibility after pandoc 1.12
was released, but at this point we can get rid of it.

T.P.Extensions: remove `Ext_compact_definition_lists` constructor
for `Extension` [API change].

Fix tight/loose detection for definition lists, to conform to
the documentation.

Closes #10889.

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