[Menus] make Edit menu items dynamic

[warpdesign]

Edit menu

• cut enabled when:

  • explorer active

  • no dialog opened

  • not fs.readonly

  • at least 1 file selected

  • copy enabled when:

  • explorer active

  • no dialog opened

  • at least one file selected

• copy path

  • explorer active
  • no dialog opened
  • at least one file selected

• copy filename

  • explorer active
  • no dialog opened
  • at least one file selected

• paste

  • explorer active
  • no dialog opened
  • cache is not readonly
  • clipboard.length > 0
  • status === 'ok'

• select all

  • explorer active
  • no dialog opened
  • files.length > 0
  • status === 'ok'