added bindXXX methods to StatementProcessor as sqlite_bind_xxx wrapper.
As suggested in review. This will make the caller code simpler. It's also safer in that the caller doesn't have to manipulate the statement separetely (in the previous way StatementProcessor and the caller could use different statements). Also made naming more consistent: in the very initial version the class was called "Executer" and then renamed to Processor. Some variables of this class were still named "exec", etc, but it's more consistent if they are named like "proc".
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