durand-dict: Add a framework, and add structure to parsing

durand-dict.el: Now we have a framework that potentially supports
searching other dictionaries than the single agarathi dictionary.

Also, the parsing of the agarathi search results is much more
structured now, and so is the presentation of the search results: each
definition is listed in a separate item, and the examples are grouped
under one heading, so that the user can skip these examples at will.
And the presentation replaces every continuous block of spaces by one
single space.

As the consequence of all these, the readability is massively
improved.

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