clean: do not use strbuf_split*() [part 1]

builtin/clean.c:parse_choice() is fed a single line of input, which
is space or comma separated list of tokens, and a list of menu
items.  It parses the tokens into number ranges (e.g. 1-3 that means
the first three items) or string prefix (e.g. 's' to choose the menu
item "(s)elect") that specify the elements in the menu item list,
and tells the caller which ones are chosen.

For parsing the input string, it uses strbuf_split() to split it
into bunch of strbufs.  Instead use string_list_split_in_place(),
for a few reasons.

 * strbuf_split() is a bad API function to use, that yields an array
   of strbuf that is a bad data structure to use in general.

 * string_list_split_in_place() allows you to split with "comma or
   space"; the current code has to preprocess the input string to
   replace comma with space because strbuf_split() does not allow
   this.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

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