new continent window for prisk

some further enhancements to prisk: latest version got a brand new continent window, listing the continents, their bonus, and who owns the countries. it also highlights when a continent is totally owned by a player. it is also updated during the game, when players gain and loose countries.

without further ado, here's a snapshot of the new shiny feature:

also new in version 3.101430, the ability to run prisk directly from the checkout. previously one would need to run "dzil run ./bin/prisk" since file::sharedir requires a fully built + installed distribution before finding its stuff. now, prisk detects if it's running in a local checkout, and will bypass file::sharedir.

the code is on github where you can fork it: patches and translations welcome!