Custom Bootstrap options

[bluesign]

Closes #???

Description

This adds custom bootstrapping to emulator

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For contributor use:

• [ ] Targeted PR against master branch
• [ ] Linked to GitHub issue with discussion and accepted design OR link to spec that describes this work
• [ ] Code follows the standards mentioned here
• [ ] Updated relevant documentation
• [ ] Re-reviewed Files changed in the GitHub PR explorer
• [ ] Added appropriate labels