Changelog:

• Added Xbox One
• Added Xbox 360
• Added Nintendo Wii (+ Nunchuk, Classic Controller)
• Added Nintendo WiiU
• Added PlayStation 1, 2 and 3
• Added Steam Controller
• Added controller icons for each system
• Added keyboard icons (spacebar, backspace, etc.)
• Added number flairs (0 – 9)
• Merged PlayStation 1 – 5 (due to overlap)
• Fixed inconsistent naming (keyboard, arrows)
• Fixed Playdate SVG files
• Fixed icon names (Xbox, PlayStation)