CDS-convertor support clics-with-points export

[lperovskaya]

to use as follows:
Challenge at codeforces -> event-feed-with-points -> icpc tools resolver with points like in
https://www.youtube.com/watch?v=OHB0hcwfq4c&t=254s

support scoring rules "max" or "last", lie if "group-max"

[kunyavskiy]

Should be done by 543fed8, testing required