NEW: add cs_set_user_frags

[TheKrytyk]

Hello, since there is a cs_set_user_deaths function and the "scoreboard" parameter has been added, it can add a new cs_set_user_frags function to be able to set frags to the player along with refreshing in the "scoreboard".

[dystopm]

The death counter is stored in a member from the CBasePlayer class. The frag counter is an entvar, non-player entities also have it, it exists on every goldsrc game. Guess yourself