Implement prefixed setters

Related to #1805, this change adds an optional `setterPrefix` parameter
to the `Builder` annotation; if this parameter is unspecified or blank
the behavior of the `Builder` annotation is unchanged, but if it is
present the value specified will be prefixed to the generated methods.

For example, using:

```
@Builder(setterPrefix = "include")
class Foo {
    private int someValue;
}
```

will result in a generated `Builder` class containing an `includeSomeValue(int someValue)`
method instead of the default `someValue(int someValue)`.

0 files changed, 0 insertions, 0 deletions