New effect: Increase weapon shooting rate

[Lordmau5]

2 issues:

• File isn't named according to spec (it's missing Effect at the end of the filename)
• The Tec9 is shooting considerably slower with this. I've tested it and multiplying by 0.8f instead of 0.75f makes it work and doesn't look noticably slower with the other guns

[Lordmau5]

You can use the eModelID values for the array btw

static const std::array weaponsId
    = {MODEL_COLT45,  MODEL_SILENCED, MODEL_DESERT_EAGLE, MODEL_CHROMEGUN,
       MODEL_SAWNOFF, MODEL_SHOTGSPA, MODEL_MICRO_UZI,    MODEL_MP5LNG,
       MODEL_AK47,    MODEL_M4,       MODEL_TEC9};```

[gromchek]

The idea of the effect came when I was reading the weapons.dat config. So I quickly copied the ids and started coding. I also added OnTick function because the game resets the weapon info after loading the save file.