Parse frag matrices and show them on the "game info" page.

For the longest time the servers have been sending individual frag values after player records. They looked like this:

P hashkeyvalhere
n Nickname
i 1
kills-2 5
...

...which meant that the player whose index is 1 fragged the player whose index is 2 five times.

This MR parses these records, stores them in the player_game_frag_matrix table, then uses them to display a table on the "game info" page.