Ability to add data:image;base64 as images

## Guidelines

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## Feature request template

**Is your feature request related to a problem? Please describe.**
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

It would be more convenient if data:image urls could also be used as images, this would make it easier to insert images without needing to upload them to a website with cors compatibility. Additionally, base64 images are supported when all nodes are fit with the same image in graph display settings, but not when they are in the graph as a field.

**Describe the solution you'd like**
A clear and concise description of what you want to happen.
Base64 images should be recognized and allowed to be set as images.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
Add any other context or screenshots about the feature request here.