Node creation for image/media-links in created canvas

[UNEXENU]

Issue:
When creating a canvas from a given note, links to media files are threated just like links to markdown files - a node will be created for each of them. As e.g. images will be displayed within the file they're embedded in anyways - and are probaply also easier to understand/only useful in context -, i'd prefer this to be an optional feature.

Proposed Solution:
Add a Black-/Whitelist option for filetypes in settings, en-/disabling the creation of nodes for the given filetypes.