text: Title: [Feature Request] A way to reevaluate all cells
  Body: Add a command that will rerun all cells. This would be especially useful after loading a save file. To quickly restore the kernel state to way it was before.
  
  - `:MoltenReevaluateAll`
  
  stolen issue from: https://github.com/dccsillag/magma-nvim/issues/29