Fix kill and damage counters related to Update 205

[chrhasse]

Description

lib/managers/statisticsmanager now requires lib/units/enemies/cop/CopDamage as seen here which causes Wolfhud to hook into the cop damage events twice in DamagePopup.lua, KillCounter.lua, TabStats.lua, and GameInfoManager.lua. This commit causes WolfHUD to check to see if the the given file has already been loaded before adding the hooks.

Fixes #918

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Selected a random heist from crime.net, then watched the damage popups and kill counters in tabstats and on the hud to ensure accuracy
• Finished the heist and selected a second to ensure the fix is retained after multiple heists

Checklist:

• My changes generate no new warnings
  Truthfully I don't know how to check this. I am not proficient at lua and I am not positive this is the best way to make this change. However it does seem to work and it's a very small change, only 8 loc changed so it should be simple for someone more experienced to ensure that it's a good idea.

[jaondayko]

Hey there! I grabbed this pull request and put it in my repo if you would want to update there instead! The owner of this one has been missing for a bit! I am currently out of town so I didn’t get a chance to take a look and if this fixes it I thank you a lot!

[icwiener25]

Thank you, this has fixed the issue.

[NihiliusDE]

THX, works fine :)