* introduced Attackable wrapper class for opponents to be able to also
attack items
* changed set_opponent to use Attackable
moved first logic into Attackable
* added dynamic property which returns a pointer of the object instead of
a copy like the current imp.
needed to be able to eg store a vector
* send engage/disengage events
send hp status bar
* send attackable item flag in world item pkt
* apply damage for items + evid_damaged
* react to statrequests
* adapted is_attackable and do attack_effects
* fixed clear_opponent_of
* fixed clear_opponent_of
* allow attack pkt
* apply damage
* items need to keep track of the opponents to be able to cleanup on
destroy
* updated dynproperties
* updated dynprops a bit more.
made the structs trivial copyable
updated concept to not repeat the types
* run hitscript, cleanup
* listhostiles and attack_once accept now Attackable
* set opponent when dblclicked
* dont let hp underflow
* only attack if you are in warmode
* evid_opponent_moved for attackable items
* if its the same opponent dont send engaged events again
added test for listhostiles with two mobs
* allow attackable item for setopponent
* some tests npc vs item
* missing files
* fixed clang tidy complain
* test for enter/left area
* do not send hp updates while char gets created and not yet added to the
world
* testclient fight packets
* client event constants
* added client tests for attacking npc and item
* increase damage
* removed leftover comment
* when an attackable item was destroyed the opponents where not correctly cleared
* orphan check for is_attackable
* moved statmsg for items
* init member
* moved send_hightlight back into if statement
check before dereferencing
* use range version of statmsg
* adapted em params
* comparison operator
made explicit constructors
for symmetry return damage in Item::apply_damage
* get rid of bools
* split attack method a bit
* use constants for F3 flag
* destroy item on hit if hp reaches 0 if no controlscript exists
* only toplevel items are attackable
small refactoring
more tests
* more tests
* even more tests
* docs
