Log crossbow heals + Fix wrong heal on damage

[F2]

shock mentioned to me that TFTrue doesn't seem to be logging crossbow heals, and it was also reported in issue #57.

It turns out that the player_healed event does log crossbow heals, but we don't handle this event when tftrue_logs_includebuffs is enabled. In that case, we need to use the crossbow_heal event. I tested that it works in various scenarios. Assume that the arrow can do 100 hp healing, and that we are healing a soldier:

• When the patient is 50 hp, the full 100 hp healing is logged
• When the patient is 150 hp, the full 100 hp is still logged (even though technically it only heals 50 hp) - I think that's okay, since it's the same behaviour we have for damage
• When the patient is 200 hp or above, the event is never triggered, and no log is written

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Additionally, I stumbled upon a different problem: The player_healonhit event is triggered for the patient when they are healed by an arrow. This is a problem because we store the heal value in m_uiLastHealOnHit, and log it the next time they do damage, as if they were responsible for healing themselves (like when using the Black Box).

However, according to my tests, the crossbow_heal event is fired after the player_healonhit event, so we can simply overwrite that value with 0, preventing it from being logged at the next damage event.

Note that this bug is present regardless of tftrue_logs_includebuffs, so we have to always overwrite it.