Make ObjectContext only accessible through a getter

Issue#: CODE-2614


git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@24116 ef53c05b-3124-4d59-ae7d-fe3273f42be7
Move fields to top of LoadContext file
Issue#: CODE-2614


git-svn-id: svn+ssh://svn.code.sf.net/p/pcgen/code/Trunk@24117 ef53c05b-3124-4d59-ae7d-fe3273f42be7