#63 add support for %REPTOK and %REPSTR, as well as %*, %**, etc

[nasm64developer]

In my local forked version I have added support
for %REPTOK (a la MASM's IRP/FOR) and %REPSTR (a
la MASM's IRPC/FORC), as well as %*, %**, etc.

The attached file contains the required changes.

[nasm64developer]

[nasm64developer]

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This addresses SF #629491.

[nasm64developer]

[nasm64developer]

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SF RFE #1241018 suggests %+0 and %-0 support,
which would require the changes from this RFE.

[nasm64developer]

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See SF RFE #1365092 for newer code.

Note that said newer code implements %*, %%*, %%%*, etc.
instead of %*, %**, %***, etc. -- to ensure that there's
overall consistency: additional % characters result in a
reference to an outer loop (or macro).

[nasm64developer]

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The newer code also fixes a core dump, which
otherwise occurs if %* expands into nothing,
and resides at the end of a line.

[nasm64developer]

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I have closed SF #626491 in favor of this one.