[IMP] Clipboard: support images in the clipboard

[rrahir]

Description:

This commit adds the support of images in the clipboard. Namely,

• Pasting an image from the OS clipboard will automatically upload it to
  the filestore and dispatch a CREATE_IMAGE accordingly.
• Copying a chart or an image from the spreadsheet will add it to the
  oOS clipboard. It can then be pasted somewhere else, like a discuss
  app, a text editor maybe?.

TODO

• support multi type of images (not just png) It technically works
  because we never check agains the actual type of the file we upload
  but it's wrong. Maybe use a generic image/* mimetype instead of using
  png. We still need to purge out dangerous mimetypes like image/svg(+xml)
• Currently uploads the image from the clipboard THEN only checks if the
  we are copy pasting from the same spreadsheet clipboard (potential
  useless upload)
• Not supported by some apps like Office 365 online (word & powerpoint tested). Supposedly because our
  clipboard has some text/* types along the image/* so it ignores the
  later. for a fully integrated feature, we should probably decorrelate it
  from the standard copy paste and make a menu "copy image to os
  clipboard" ? tbd
• works on discord at least
• No test whatsoever
  Task: 4241877

review checklist

• feature is organized in plugin, or UI components
• support of duplicate sheet (deep copy)
• in model/core: ranges are Range object, and can be adapted (adaptRanges)
• in model/UI: ranges are strings (to show the user)
• undo-able commands (uses this.history.update)
• multiuser-able commands (has inverse commands and transformations where needed)
• new/updated/removed commands are documented
• exportable in excel
• translations (_t("qmsdf %s", abc))
• unit tested
• clean commented code
• track breaking changes
• doc is rebuild (npm run doc)
• status is correct in Odoo

[robodoo]