Start refactoring

frontend/src/scripts/drawing/lights/point-light.ts

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+import { ILight } from './i-light';
+import { vec2, vec3 } from 'gl-matrix';
+
+export class PointLight implements ILight {
+  public static uniformName = 'lights';
+
+  constructor(
+    public center: vec2,
+    public color: vec3,
+    public lightness: number
+  ) {}
+
+  serializeToUniforms(uniforms: any): void {
+    const listName = PointLight.uniformName;
+
+    if (!uniforms.hasOwnProperty(listName)) {
+      uniforms[listName] = [];
+    }
+
+    uniforms[listName].push({
+      center: this.center,
+      radius: 0,
+      value: this.value,
+    });
+  }
+
+  get value(): vec3 {
+    return vec3.scale(vec3.create(), this.color, this.lightness);
+  }
+}