Begin an incremental boot. The VM is ticked each frame via `ui()`. `max_steps` is the step budget (from settings) before the boot times out.
(
&mut self,
assembled: &AssembledOutput,
user_binary: Option<&AssembledOutput>,
fs_image: Option<&[u8]>,
max_steps: u64,
autorun_command: Option<&str>,
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