Remove healing combat intterupt and add EF to walk over monster

[mtwango]

optional OF_DontInterruptHealOnHit to skip interrupt on getting hit, so scripters can implement their interrupt in hit / gethit triggers
experimental EF_WalkBypassMonsters to leverage personalspace trigger on NPC without full stamina. Experimental, because this is resource intensive (lots of packets) when denied by trigger.

[mtwango]

Note: healing doesnt get interrupted by hit, but still fails on skill abort. Might be related to #1442

[mtwango]

Need to fix the branch, since I merged some stuff here on our shard by accident.

[mtwango]

The healing OF is for discussion.

Maybe it should not be as a OF, but removed by default. It doesn't take into account veterinary (in core) and seems like an agressive way to stop action, since scripters can make an easy replacement in scripts, ie in character events:

on=@getHit
  if (<action> == Healing)
    sysmessage <defmsg.healing_interrupt>
    action = -1
  endif

[mtwango]

Great discussion :D

I've updated the PR to remove healing interrupt and how to add it to script pack.