Syntax for object definition

Either;
```C
A : B::C() {
}
```
or
```C
A : B = B::C() {
}
// Which is the same as
A := B::C() {
}
```

The second syntax is more inline with literal definition which is `a : b = c` i.e. `myNum : int = 5` or `myNum := 5`