AI update -- some adjustments to priorities, techs, and ship designs, including support for AI using engine parts in some designs; also added a combined Production (industry and research) chart to the standalone AI progress charting

git-svn-id: svn://svn.code.sf.net/p/freeorion/code/trunk@7709 dbd5520b-6a0a-0410-a553-f54834df5b05