Fix ESLinting errors and remove TSLint

src/file/numbering/level.spec.ts

@@ -1,9 +1,8 @@
 import { expect } from "chai";
 
-import { LevelFormat, LevelSuffix } from ".";
 import { AlignmentType } from "..";
 
-import { Level } from "./level";
+import { Level, LevelFormat, LevelSuffix } from "./level";
 
 describe("Level", () => {
     describe("#constructor", () => {

src/file/numbering/level.ts

@@ -180,9 +180,6 @@ export class LevelBase extends XmlComponent {
 export class Level extends LevelBase {
     // This is the level that sits under abstractNum. We make a
     // handful of properties required
-    public constructor(options: ILevelsOptions) {
-        super(options);
-    }
 }
 
 export class LevelForOverride extends LevelBase {}