Generate error messages and SQLstate from Firebird 5.0

[mrotteveel]

Previously, the Firebird builds produced a MSG.FDB which contained error information, which is used by the MessageDump utility to generate error message and sqlstate files. In Firebird 5.0, this was changed, and the build no longer produces a queryable database. Instead, we need to parse the information from from include/firebird/impl/msg.

[vasiliy-yashkov]

Hi @mrotteveel! I recently wrote a program to generate property files containing error codes and error messages from Firebird 5. Written in c++. If you are interested, you can have a look at it - https://github.com/vasiliy-yashkov/message_dump

[mrotteveel]

Update messages itself closer to release of Jaybird 5.