quasilit: split format_field into two functions.

The objective of this work is to isolate the field-formatting
logic so we can target it in the compiler.

Currently, the sys:quasi special operator relies on calling
subst_vars, which calls format_field. Both subst_vars
and format_field perform dynamic evaluation, requiring
an environment. In the compiler, this will be replaced by
macro-generated logic; but we would like to obtain the use of
the lower-level field formatting as a pure function.

* eval.c (do_format_field): New static function. Does the
field formatting previously done in format_field. Also
performs the indexing on the object implied by the numeric
or range modifier; but the range or index is already
computed and comes in as a parameter.
(format_field): Perform the modifier parsing only, requiring
the dynamic evaluations via eval_fun, and then call
do_format_field on the extracted data. The range indexing
on the input sequence is no longer done during the parsing of
the modifiers. That unfortunately changes some behaviors that
are possible but are fortunately obscure and undocumented.

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