Ballistics - BI P90 and RHS MP7 updated

[Laid3acK]

When merged this pull request will:

• Fix the RHS MP7 magazines and zeroing.
• Update the BI P90 and RHS MP7 ballistics with these HK MVs and BCs references.
  AirFrictions according with all BCs and MVs at the normal conditions (15°C, 1013 hPa, 0%).

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Ammo Class: rhs_ammo_46x30_FMJ
Drag model: 7
Ballistic coefficient: 0.089
MaxRanges (m): [300, 300]
MuzzleVelocities (m/s): [615, 625]
Max. Velocity diff (m/s): 19.83
Max. Drop diff (cm): 0.99
Max. Tof diff (ms): 4.0
Optimal airFriction: 0.002635
##########################################
Ammo Class: rhs_ammo_46x30_JHP
Drag model: 1
Ballistic coefficient: 0.112
MaxRanges (m): [300, 300]
MuzzleVelocities (m/s): [685, 695]
Max. Velocity diff (m/s): 45.25
Max. Drop diff (cm): 2.48
Max. Tof diff (ms): 26.0
Optimal airFriction: 0.00372331
##########################################
Ammo Class: rhs_ammo_46x30_AP
Drag model: 1
Ballistic coefficient: 0.141
MaxRanges (m): [300, 300]
MuzzleVelocities (m/s): [675, 685]
Max. Velocity diff (m/s): 26.24
Max. Drop diff (cm): 0.67
Max. Tof diff (ms): 9.0
Optimal airFriction: 0.00304544
##########################################
Ammo Class: B_570x28_Ball
Drag model: 7
Ballistic coefficient: 0.084
MaxRanges (m): [300, 400]
MuzzleVelocities (m/s): [715, 755]
Max. Velocity diff (m/s): 23.6
Max. Drop diff (cm): 1.95
Max. Tof diff (ms): 10.0
Optimal airFriction: 0.00261886
##########################################