[Feature Request] Simpler node & edge customization options

## Description
The current node and edge customization options have a lot of options that can be intimidating for some users.

For simple customizations Graph Explorer should offer a few pre-built options that are easy to apply.

## Preferred Solution
- [ ] Add a list of pre-defined color options
- [ ] Add a list of included icons for nodes
- [ ] Move current customization options in to an "advanced" or "custom" mode
- [ ] Add ability to reset icon image, if customized

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