Add support for gson SerializedName

[sarimmehdi]

Can you add support for SerializedName? This way we can assign field names different than the variable name. Example:

public class Pose {
    Camera camera;
    Anchor anchor;
    @SerializedName(value = "recording-id")
    int recordingId;
    Bbox bbox;
    @SerializedName(value = "track-id")
    int trackId;

    public Pose(Camera camera, Anchor anchor, int recordingId, Bbox bbox, int trackId) {
        this.camera = camera;
        this.anchor = anchor;
        this.recordingId = recordingId;
        this.bbox = bbox;
        this.trackId = trackId;
    }

    public void setBbox(Bbox bbox) {
        this.bbox = bbox;
    }
}

pose = new com.memex.gson.Pose(cameraJson, anchorJson, recordingId, bbox, trackId);
new TomlWriter().write(pose, poseFile);

This is incorrectly serialized as:

recordingId = -1
trackId = 0

[anchor]
latitude = 44.4259019
longitude = 8.8628793
name = "42850a73-9fbd-4ba5-a0e3-2e04644f24c1"

[anchor.orientation]
w = 0.9143955
x = 0.0
y = 0.40482244
z = 0.0

[anchor.translation]
x = -0.8728261
y = -0.30460373
z = -0.37339234

[bbox]
x1 = 360
x2 = 454
y1 = 293
y2 = 183

[camera.orientation]
w = -0.63340276
x = 0.06788388
y = 0.31760123
z = 0.702369

[camera.translation]
x = 0.11091955
y = -0.0041119093
z = -0.06686936

recordingId should be recording-id and trackId should be track-id