message: clarify the program.files key
diff: @@ -96,7 +96,7 @@ export class Program {
  /**
  * A map of every file loaded into this program
  */
  - public files = {} as { [filePath: string]: BrsFile | XmlFile };
  + public files = {} as { [pathAbsolute: string]: BrsFile | XmlFile };
  private scopes = {} as { [name: string]: Scope };
  