Update version for dev work 6.04.00RC04-SNAPSHOT

git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@25148 ef53c05b-3124-4d59-ae7d-fe3273f42be7
Update info for next release.
Update readme for RC3

git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@25149 ef53c05b-3124-4d59-ae7d-fe3273f42be7