Misc.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@57681 65644016-39b1-43b1-bf79-96bc8fe82c15
Replaced ICoerceMetadata with IMetadataBuilder and add a builder creator method in IMaster.

This change is to make applications who define they own message format (without metadata inspection and coercion) to easily create its IMessageMetadata.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@57682 65644016-39b1-43b1-bf79-96bc8fe82c15