rm old outdated and unsupported plugins or mark for deleletion and DEPRECATED

[kuvaldini]

page https://micro-editor.github.io/plugins.html

they are

• bounce is there a way to store location on exit and restore on open? sparques/micro-bounce#6 (comment)
  • not supported and outdated
  • those functions are now part of actual vanilla version of micro
• cheat
  • abandoned by authors
  • buggy