Credit kills by illusions of the victim instead of dropping them as suicides

[geracosta]

kills_log and killed_by drop any kill where the combat log attacker has the same unit name as the victim. That's meant for suicides (Techies), but it also swallows a real kill class: an illusion of the victim landing the killing blow — Grimstroke's Dark Portrait, Shadow Demon's Disruption, Wall of Replica. The attacking illusion carries the victim's unit name, so the filter can't tell it apart by name, but attackerillusion can: a real suicide is never dealt by an illusion.

Attribution comes out right on its own: sourcename already resolves illusion damage to the owning hero (the same mechanism damage counting uses), so the recovered kill lands on the illusion's owner.

Example (reported by a user on Discord): match 8754463676 has radiant score 39, but radiant kills_log sums to 38. The missing one is Muerta's death at 2057s, dealt by a Dark Portrait illusion of herself — Grimstroke bought Aghs at 2012s, and his damage map includes muerta_gunslinger / muerta_pierce_the_veil, which only that illusion can produce. The scoreboard credits Grimstroke with 5 kills; his kills_log has 4.

Validation:

• Match 8754463676 reparsed with this branch: the only changes vs master are Grimstroke's kills_log 4→5 (adds {"time": 2057, "key": "npc_dota_hero_muerta"}), his killed map muerta 1→2, Muerta's killed_by grimstroke 1→2 (her killed_by now sums to her 4 deaths), plus the corresponding teamfight entry. Radiant kills_log total becomes 39 = radiant score.
• Regression: the standard test replay (1781962623) produces a byte-identical blob — its 3 suicides are still filtered.

Related: odota/core#1430 is the neighboring case (a tower lands the last hit while the game credits a nearby hero) — that one isn't recoverable from the combat log; this one is.