Revise Windows time-zone mapping to use proper IANA IDsHEADdev

The CLDR's "IANA" IDs may (for the sake of stability) date back to
before IANA's own naming has been updated. As a result, the "IANA" IDs
we were using were in some cases out of date. CLDR does provide a
mapping from its stable IDs to all aliases and the current IANA name
for each (which I shall soon be needing in other work), so use that to
map the CLDR IDs to contemporary IANA ones.

Revise the documentation of CldrAccess.readWindowsTimeZones() to take
this into account, pass it the alias mapping from the table, use that
to map IDs internally and, in passing, rename a variable.  Update
cldr2qtimezone.py to match the new CldrAccess methods and regenerate
the data.

Change-Id: I23d8a7d048d76392099d125376b544a41faf7eb3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Mate Barany <mate.barany@qt.io>

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