fixes for dotCover support

[isakiev]

1. Filters parameter wasn't actually passed to dotCover command line
2. There was no way to perform any additional dotCover configuration (e.g. enable logs, specify verbosity and ~10 less frequently used arguments)
3. cosmetic naming improvements

• dotCover report is often confused with dotCover snapshot
• "dotCover.xml" as a report name is often confused with "dotCover.xml" as a console runner configuration file name

source request:
https://devnet.jetbrains.com/message/5532079

[forki]

thanks