Implement Global Sets

[freezy]

In Visual Pinball, under Preferences / Configure (Optional) Global Physics Sets, you can define up to nine "Sets", which are flipper and playfield settings that will override those defined in the table. Sets can also be imported and exported.

In the code, these show up as override* properties of the data object. For example, the FlipperData has those props:

public overrideMass?: number;
public overrideStrength?: number;
public overrideElasticity?: number;
public overrideElasticityFalloff?: number;
public overrideFriction?: number;
public overrideReturnStrength?: number;
public overrideCoilRampUp?: number;
public overrideTorqueDamping?: number;
public overrideTorqueDampingAngle?: number;
public overrideScatterAngle?: number;
public overridePhysics?: number;

Those would be set from the global sets. Currently they are undefined.

This is probably low priority.