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Or1ksim does not use consistent config parameter names

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Information:
Type :: BUG
Status :: CLOSED
Assigned to :: Jeremy, Bennett

Description:
Or1ksim does not use consistent names for config parameters. This makes errors by the user more likely.

Main culprit is parameters, which are filenames. This is variously called:
- vapi_fn (section vapi)
- filename (sections vga, fb)
- file/rxfile/txfile (sections ethernet, kbd)

I suggest the parameter should be "file" where this is no direction implied and "rxfile" or "txfile" where a direction is implied.

In section gpio, the parameter is called "base_vapi_id", where all other sections refer to this as "vapi_id". Although GPIO is unusual in actually using more than one VAPI ID, all sections may use more than one. For consistency, I suggest that the keyword "vapi_id" is used throughout.

In all cases, the legacy name should be permitted for backwards compatibility.

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