CS2: afx_interop

[MichaelCampagna]

afx_interop
Achieve the similar functionality as the afx-unity-interop project. Either Unity support for the newer URP would be preferred as it has replaced LWRP and would most likely have better performance than built-in render pipeline or HDRP, or preferably Unreal Engine support.

Dependencies:
mirv_calcs - positional data for camera/game entities: #873
mirv_listentities - retrieval of entity handles: #874

[dtugend]

Hi. In light of issue #896 I decided to close this issue for now, since afx_interop was a sort of complicated premium feature and benefits only a small share of HLAE users, which are mostly not so small companies.