Allow connecting all basic types to a boolean input pin

[Naros]

Description

Godot has a concept called Variant::booleanize where any Variant type can be applied in a boolean operator condition to determine whether or not it evaluates to true or false. This can be useful in graphs to minimize the number of nodes needed to test specific conditions.

There is a few caveats, such as types like the Vector, Projection, Quaternion, and others have what is called a baseline representation of their internal indexed/keyed components that represent a false condition. For example, Vector2, Vector3, and Vector4 all will return false when their internal x, y, z, and w fields equal 0. Similarly when Projection, Quaternion, and others internally represent their "Identity" or default value when using Projection() or Quaternion(), this too represents false.

Implementation ideas

Adjust OScriptNodePin::can_accept to always allow connecting to BOOL input pins.