Network handicap "level" to the client and display on scoreboard

Network handicap "level" to the client and display on scoreboard

Total bidirectional handicap (client-set & server-enforced, and given & taken) is now networked to the client with .handicap_level.
- Values from 1 to 5 are mapped to be between 1 and 255 resulting in the "level". The "5" value is arbitrary and can be replaced in future.
The handicap logo now displays on the scoreboard next to players with .handicap_level > 0.
- Starts as white at 1, becomes full-red as the handicap level increases up to 255.
Also changed spaces to tabs in qcsrc/common/ent_cs.qh as a cleanup.
None of the newly added code should become redundant after 0.9 releases.