Add color cycle to LineDrawer

Makes it so that when you add a line it assigns a default color.

Change-Id: I87417acaca5612141e7e8fe095ef02c6bfa759d4
diff --git a/frc971/control_loops/drivetrain/drivetrain_plotter.ts b/frc971/control_loops/drivetrain/drivetrain_plotter.ts
index 0c01f6a..f55f965 100644
--- a/frc971/control_loops/drivetrain/drivetrain_plotter.ts
+++ b/frc971/control_loops/drivetrain/drivetrain_plotter.ts
@@ -2,19 +2,13 @@
 import {AosPlotter} from 'org_frc971/aos/network/www/aos_plotter';
 import {ImuMessageHandler} from 'org_frc971/frc971/wpilib/imu_plot_utils';
 import * as proxy from 'org_frc971/aos/network/www/proxy';
+import {BLUE, BROWN, CYAN, GREEN, PINK, RED, WHITE} from 'org_frc971/aos/network/www/colors';
 
 import Connection = proxy.Connection;
 
 const TIME = AosPlotter.TIME;
 const DEFAULT_WIDTH = AosPlotter.DEFAULT_WIDTH;
 const DEFAULT_HEIGHT = AosPlotter.DEFAULT_HEIGHT;
-const RED = AosPlotter.RED;
-const GREEN = AosPlotter.GREEN;
-const BLUE = AosPlotter.BLUE;
-const BROWN = AosPlotter.BROWN;
-const PINK = AosPlotter.PINK;
-const CYAN = AosPlotter.CYAN;
-const WHITE = AosPlotter.WHITE;
 
 export function plotDrivetrain(conn: Connection, element: Element): void {
   const aosPlotter = new AosPlotter(conn);