Feature: Visual improvements for P1 Portal Gun addon

[KrisCatboy]

Which component should be improved?

Other

Describe your suggestion

• Recreate muzzleflash as particle effect replacement, rather than using the AR2 muzzleflash animation event. (Portal gun muzzle flash is missing #917 needs to be fixed for this)
• Bring back P1's holding beams effects. doing this as a particle replacement is not practical, so it needs to be done by implementing P1's holding beam effects code-side.
• Bring back P1's tube light sprite, including its white colour when there are no portals active
• Bring back P1's top light sprite. unlike the tube light, it's not there when there are no portals active