[Client] Slide pad movements (Left stick)

[vicksonzero]

As a mobile player I want to have a slide pad for movement So that I don't have to plug a keyboard to my phone (Kappa)

• Make the slide pad on the left screen
• sends its input as a directional vector of length 0 to 1
• makes a player move in the game world by the directional vector, with non-snapped speed
  • also store a unit vector in player indicating currently facing direction

Spec: https://github.com/vicksonzero/cook-engine/wiki/Client-Interface

optionally depends on #1

[vicksonzero]

optionally depends on #1

[199911]

Found 3 libraries https://github.com/jeromeetienne/virtualjoystick.js https://github.com/bobboteck/JoyStick https://github.com/yoannmoinet/nipplejs will test them one by one later