Three or more decimal digit property values for "real" properties are not properly supported

Some properties of Quick3D effects required 3 or even 4 digit accuracy for meaningful adjustment. The most prominent example of this is amount property of Emboss effect, where the accepted value range is [0, 0.01].

Currently the property editor (or the property backend) doesn't consistently allow changing property value to one with 3 or more decimal digits, even when 3 or 4 digits have been defined for the SpinBox control.

E.g., adjusting Emboss amount: 0.01 -> 0.005 is allowed and goes through, but 0.005 -> 0.007 does not go through. It seems that any change where two most significant digits of the decimal part do not change, the change is just ignored.