Added READMEs and new API headers to Windows snapshots.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58525 65644016-39b1-43b1-bf79-96bc8fe82c15
Added plugins.conf to the distribution.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58529 65644016-39b1-43b1-bf79-96bc8fe82c15
Updated the distributed examples.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58530 65644016-39b1-43b1-bf79-96bc8fe82c15