Convert the schemas from LegacySchemaTables.java to C++.
Some FIXMEs still left because of types we don't yet support, or
schema features we don't yet support - this will be fixed later.
Note that I put legacy_schema_tables in the "db" namespace, not in the
"schema" namespace where Origin had it. This was the *only* class in
the "schema" package in Origin, and unfortunately in Urchin we can't use
the name "schema" as a namespace, as we already have it as a class.
Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>
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