Simplify extraction of title in embedded syntax

Embedded: prevent title interfering with alignment

Use title as alternative text for a diagram

Fix embedded diagrams in old page revisions

Only use data-uri in preview. Partially fixes #40

Because data-uris are cross origin, our link fixing JS does not apply.
This uses data uris only in preview, fixing links for normal display.

We cou

Only use data-uri in preview. Partially fixes #40

Because data-uris are cross origin, our link fixing JS does not apply.
This uses data uris only in preview, fixing links for normal display.

We could think about fixing targets when saving already...

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use data url instead of export to display embedded diagrams

This fixes displaying diagrams during preview

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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Fix too greedy regex

Otherwise multiple diagrams on the same page match

refactored action components

more strict separation of modes

Editing embedded diagrams now works

more checks on the embedded SVG

we only want to work with diagrams.net created SVGs

sanitize inlined SVGs

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

added inline display mechanism