Brush and pan events

[VargBurz]

This PR refactors zoom events

Changes:

• new options:

  zoomEvents?: {
  brush: {
    isActive: boolean;
    keyEvent: KeyEvent;
    orientation?: BrushOrientation;
  },
  pan: {
    isActive: boolean;
    keyEvent: KeyEvent;
    orientation?: PanOrientation;
  },
  scroll: {
    isActive: boolean;
    keyEvent: KeyEvent;
  },
  }

  enum KeyEvent {
   MAIN = 'main',
   SHIFT = 'shift'
  }

With new options zoom events can be divided by KeyEvent: which key should be pressed to activate the specific zoom event. KeyEvent.MAIN - zoom event active with no key KeyEvent.SHIFT- zoom event active if shift key is pressed

• fix zoom on scroll. the problem was: scroll zoom works bad with values below zero see more: https://stackoverflow.com/questions/15261447/how-do-i-capture-keystroke-events-in-d3-force-layout

• fix rewriting of deep options: use lodash.defaultsDeep indstead of lodash.defaults

• separate wheel panning and mouse panning