Add SystemStart and BootStart start types

[kkent030315]

Added SystemStart (SERVICE_SYSTEM_START) and BootStart (SERVICE_BOOT_START) start types.
This change has been tested locally.

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This change is 

[pronebird]

Would be great to document that these two new constants are used for drivers to avoid confusion with a regular SERVICE_AUTO_START.

See: https://learn.microsoft.com/en-us/windows/win32/api/winsvc/nf-winsvc-createservicea

[kkent030315]

Would be great to document that these two new constants are used for drivers to avoid confusion with a regular SERVICE_AUTO_START.

See: https://learn.microsoft.com/en-us/windows/win32/api/winsvc/nf-winsvc-createservicea

I've added more precise comments on them to avoid confusing with usermode service start types. 👍

[faern]

Sounds like a good change. This will be a breaking change since we add variants to a public enum. I think we should mark this enum as #[non_exhaustive] to prevent that in the future.

[kkent030315]

Sounds like a good change. This will be a breaking change since we add variants to a public enum. I think we should mark this enum as #[non_exhaustive] to prevent that in the future.

@faern Thank you for the review. I've added the #[non_exhaustive] attribute for the backwards compatibility (81331bc).

[dlon]

Reviewed 1 of 1 files at r3, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @kkent030315)

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src/service.rs line 89 at r3 (raw file):

#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
#[repr(u32)]
#[non_exhaustive]

It looks like this actually is exhaustive now. So maybe this attribute is unnecessary.

[kkent030315]

@dlon Thank you for the review. I've removed the #[non_exhaustive] in d450630.