Do not inflect type definitions

[daogrady]

When referencing type definitions, their name is no longer inflected, since no singular/ plural forms are generated for them.

type Points: { x: Integer; y: Integer }
type Lines: array of Points;

export class Points { ... }  // only 'Points', no 'Point'
export class Lines {
  points: Array<Points>  // not 'Point'
}