add system info fields and other missing fields

Add sytem info fields https://developers.google.com/analytics/devguides/collection/protocol/v1/parameters?hl=ru#system
Also added some useful but missing fields.

I did not write individual tests for this fields, because i must use legal requests like `pageview` or `event` for internet tests and i don't want duplicate code in tests.

Tested via phpunit and my GA account. Everything must be ok.