playerEH - Optional call function if player defined

[PabstMirror]

• Adds optional param to call event handler function if player is already defined.

This makes it simpler to use addPlayerEventHandler by adding an option to guarantee the function will be run even if the changed xxxEvent has already happened.

Example use:

[] spawn {
    // Dummy playerEH - represents some other mod has already installed the player EH system
    ["unit", {}] call CBA_fnc_addPlayerEventHandler;
    sleep 0.1;

    // This will not print out anything as the unitEvent has already happened:
    ["unit", {systemChat format ["unit eh (False) - %1",_this]}] call CBA_fnc_addPlayerEventHandler;

    // This will print right away
    ["unit", {systemChat format ["unit eh (True) - %1",_this]}, true] call CBA_fnc_addPlayerEventHandler;
};

Ref acemod/ACE3#4289

[commy2]

Rename _autoCall to _applyRetroactively for consistency with CBA_fnc_addClassEventHandler ?

[PabstMirror]

I like that var name better, switched.