Write basic JS for all blocks from bem-components

[veged]

• [x] link
• [x] button
• [x] input
• [x] textarea
• [x] checkbox
• [x] checkbox-group
• [x] radio
• [x] radio-group
• [x] menu
• [x] popup
• [x] dropdown
• [x] select
• [x] icon
• [x] image
• [x] modal
• [x] spin
• [x] progressbar
• [x] attach
• [x] z-index-group
• interfaces
  • [x] stylable
  • [ ] focusable
  • [ ] hoverable
  • [ ] ? pressable