make_xml support for new target/intelligence types
Adds make_xml support for the newly added tag counter and multiple intelligences.
Per stage intelligence can be defined using (for example): intelligence=average intelligence=good,3
This would produce intelligence starting at average, but switching to good at stage 3.
Counting tags among players is done using a count-X target. Example to target when 4 players have the "british" tag: 0-swap_cards,count-british:4=calm,Sure are a lot of Brits today.