Fix ProseMirror handling of diagrams with non-ASCI characters

Fixes #51

Strip namespaces from downloadable files

Change handling of file names during download to enable security checks

Code style

Button icons with inline SVG instead of img

Download PNG via AJAX

Add button to download diagram PNG if it exists in cache

Attach download and open buttons to diagrams

Fix reloading page after editing a diagram

Use replace() instead of reload() to avoid accidentally re-submitting forms

Rewrite links when SVG object is loaded

Link target in SVG diagrams - rewrites independent of template amd sensitive to DOM manipulation by scripts

Another fix for link target in diagrams

Link target rewrites happen on each click, not only on initial page load, because section edits destroy them.

When creating a diagram, check for existing files

fix event listener removal

using bind() creates a new function reference, causing the event removal
call to not match the registration. This saves the bound listener
reference to use it in the edito

fix event listener removal

using bind() creates a new function reference, causing the event removal
call to not match the registration. This saves the bound listener
reference to use it in the editor removal again.

See also https://stackoverflow.com/a/22870717

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use textContent not innerText to read values

innerText applies CSS transformations we don't want

save PNG file with the SVG for use in PDF export

wrap diagrams for better styling

Diagrams now have a wrapper div that makes it easier to align the edit
button with the diagram. In the future more controls (like download
options) or nicer styling

wrap diagrams for better styling

Diagrams now have a wrapper div that makes it easier to align the edit
button with the diagram. In the future more controls (like download
options) or nicer styling would be possible.

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ensure only diagram files can be edited/selected

correctly handle embed edits in prosemirror

Prosemirror: simplify form constructor

improve prosemirror behaviour

avoid duplication on drag
use pointer cursor

honor configured mode in prosemirror menu

add icons in menu

make everything work :-D

Prosemirror: don't submit the form on button presses