Automatic constructor "recognition"

[Idane]

The goal of this task is to make ShapeShift mapping work with constructor injection, to avoid having to supply object suppliers for every object.

Preliminary conclusions:

• Will probably need special behaviour for java/kotlin
• There doesn't seem to be a way to retrieve default values from constructors

Simplest example:

@DefaultMappingTarget(
class FromClass {
    @MappedField
    var first: String "first"
    @MappedField
    var second: String = "second"
}

class ToClass(
    val first: String,
    val second: String,
    val third: String?
)

Should result in a new instance of ToClass with the fields first and second mapped, and the field third being passed to the constructor as null