[New Feature] Allow the Ion Cannon screen shake values to be customised.

[CCHyper]

Description:

When the Ion Cannon fires in Tiberian Sun, the screen shakes vertically for the visual impact effect. The amount it shakes is hardcoded.

Possible Implementation:

New INI keys for the [General] section in RULES.INI that can control this; IonBlastShakeYhi=<integer> - The maximum pixel Y value. IonBlastShakeYlo=<integer> - The minimum pixel Y value. IonBlastShakeXhi=<integer> - The maximum pixel X value. IonBlastShakeXlo=<integer> - The minimum pixel X value.