Create a CPP Interface for cmp Attack

[Stan]

Currently there is some hacky atlas code to get some variables in Javascript mostly using evals. It would be better to define the component interface in c++ instead so that if changes were to be made to that function it would not break.

    CStr code = "var cmp = Engine.QueryInterface("+CStr::FromUInt(m.Entity)+", IID_Attack); " +
    "if (cmp) cmp.GetTimers(cmp.GetBestAttack()).repeat; else 0;";
        m.Simulation2.GetScriptInterface().Eval(code.c_str(), repeattime);

[Stan]

In 23592:

Add a C++ interface for CCmpAttack.
This allows Atlas not to rely on eval() to get access to the attack component.
Add a quick test for the added method.
This fixes the animation speed matching that of the actor instead of the template.
Remove some dead code after rP21359
Fixes: #5129
Reviewed by: @Angen
Comments by: @elexis

Differential Revision: ​https://code.wildfiregames.com/D2464