* Fix legacy support for navigation
* Fixes timing issue with document editors
If silverbullet was directly loaded into a document editor it would set
the darkmode after loading the editor, causing a wrong value to be
passed
* Add basic `image-viewer`
This add adds a basic image viewer using the panzoom library from Timmy
Willison
* Svgs somehow don't accept 100% width
* Make `internal` a property of a message
* Add `editor.sendMessage` syscall
* Update forgotten internal syscall
* Add small info command to image-viewer
* Change indent to two spaces
* Move zoom in button to the right
* Switch rotation direction
* Display mime type instead of file extension
