DB/commit: the mining is also useable for 434, thus removed the _335 tag
Core/SmartAI: Implement SMART_EVENT_FRIENDLY_HEALTH_PCT.

 On current clean TDB, there are a total of 106 creatures using
   SMART_EVENT_FRIENDLY_HEALTH (non-PCT) which has a flat first parameter, but
   only 8 of these use the event correctly (and therefore only 8 of them
   actually work).

Closes #10520
Core/SmartAI: Implement SMART_TARGET_CLOSEST_FRIENDLY.

Parameter is distance to search for.

Closes #10521