fixed jumpz2height(fixed height, fixed gravity)

Converts JumpZ to jump height, assuming specified gravity.

Gravity is specified as acceleration, not as sv_gravity units.

jumpz = sqrt(2 * height * gravity)

int height = jumpz2height(8.0, 1.0);
print(s:"JumpZ of 8 will let you jump ", f:height, s:" mapunits high in normal gravity");