refactor(Player): Generate and parse player script's AST

[LuanRT]

Notes:

• The Syntax Tree is generated by Jinter (which is built on top of Acorn).
• While doing this may be slightly slower than using a regular exp, it is much more reliable (plus we already cache the player functions anyway).
• findFunction expects the functions to be inside a self-invoking function.

Utils#findFunction Options & Usage Example:

export type FindFunctionArgs = {
  /**
   * The name of the function.
   */
  name?: string;

  /**
   * A string that must be included in the function's code for it to be considered.
   */
  includes?: string;

  /**
   * A regular expression that the function's code must match.
   */
  regexp?: RegExp;
};

const source = '(function() {var foo, bar; foo = function() { console.log("foo"); }; bar = function() { console.log("bar"); }; })();';
const result = findFunction(source, { name: 'bar' });
// Or: const result = findFunction(source, { includes: 'console.log("bar")' });
console.log(result);

Output:

{
  start: 69,
  end: 110,
  name: 'bar',
  node: { /**/ },
  result: 'bar = function() { console.log("bar"); };'
}

---

Closes #711