Struct wide configuration

[Nukesor]

The idea is to add some configuration options to the struct attributes.

This might look like this:

#[derive(InterStruct)]
#[merge("crate::Target", strict)]
pub struct Source {
    pub normal: String,
    pub optional: Option<String>,
}

For now these are the planned configuration flags:

• [ ] strict Enforces that all fields (unless ignored) are mapped to the target struct. A compiler error will be thrown if any fields cannot be found on the target struct.