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Handle missing PNG in dw2pdf export

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Add button to download diagram PNG if it exists in cache

Attach download and open buttons to diagrams

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make PNG cache optional

ensure only diagram files can be edited/selected

make everything work :-D

Prosemirror: don't submit the form on button presses

Handle titles and dimensions in prosemirror

Select files in media manager in Prosemirror

Simple Prosemirror menu button and edit form

Remove the SVG Sanitizer again in favor of CSP headers

This introduces a renderer that allows us to call each embedded SVG as a
separate URL with added CSP headers. This way we rely on the same safe

Remove the SVG Sanitizer again in favor of CSP headers

This introduces a renderer that allows us to call each embedded SVG as a
separate URL with added CSP headers. This way we rely on the same safety
feature as with media file based diagrams.

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refactor the media manager integration

add configuration option to enable/disable embed mode

Add ajax backends for loading/saving embedded SVGs

This also renames the syntax classes to be easier to distinguish

first go at refactoring the diagrams editor into a class

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Catch insufficient permissions early

If user has no permisssions to create a diagram in current namespace,
remove the form altogether.

Create Russian lang.php