Windows: reorganise menu ids.

A user pointed out today that IDM_PREFS overlaps the second preset,
because I forgot that IDM_PRESETS was not a single id but the base for
an open-ended series.

Looking more closely, there are several other problems with the IDM_*
constants. IDM_GAMES (used in COMBINED mode) shouldn't be at an
arbitrary distance _above_ IDM_PRESETS, because that risks a
collision; instead, the games' and presets' ids should interleave.
Also, the ids above IDM_GAMES were going up in steps of 1, which
should have been 0x10, for the usual reason that the bottom four bits
of the id aren't guaranteed. And IDM_KEYEMUL was completely unused (I
suspect it was part of the discarded WinCE support).

Now the #defines that are the bases of series are labelled as
IDM_FOO_BASE; they interleave as they should; and there's a clear
comment.

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