Prevent overflow of comment code in event body. Add border-radius to highlight code inside note body

Most of these are comments but a few are strings for users.

Might be an idea to run this from time to time:
https://github.com/lyda/misspell-check

It runs mostly clean now.

Prepared diff view for multiple view modes

Converted commits.js to coffeescript
image info in separate coffeescript file

Added swipe view mode

Added onion skin viewMode

switch to use link_to_member to prevent 500 if user is a project owner but does not have membership and leave comment

Allows previews and uploads in all forms.
Also fixes #1730

-`remove comment` button will not make the text jump anymore.